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Part IV

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

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FORM 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE
SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2010

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SIMON PROPERTY GROUP, L.P.
(Exact name of registrant as specified in its charter)

225 West Washington Street
Indianapolis, Indiana 46204
(Address of principal executive offices) (ZIP Code)

(317) 636-1600
(Registrant's telephone number, including area code)

Securities registered pursuant to Section 12 (b) of the Act: None

Securities registered pursuant to Section 12 (g) of the Act: None

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            Indicate by check mark if the Registrant is a well-known seasoned issuer (as defined in Rule 405 of the Securities Act). Yes ý    No o

            Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes o    No ý

            Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ý    No o

            Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes o    No o

            Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of Registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ý

            Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller company. See the definitions of "large accelerated filer," "accelerated filer," and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

            Indicate by checkmark whether the Registrant is a shell company (as defined in rule 12-b of the Act). Yes o    No ý

Registrant had no publicly-traded voting equity as of June 30, 2010.

            Registrant has no common stock outstanding.

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Documents Incorporated By Reference

            None.

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Simon Property Group, L.P. and Subsidiaries
Annual Report on Form 10-K
December 31, 2010

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Part I

Item 1.    Business

            Simon Property Group, L.P., is a Delaware limited partnership and the majority-owned subsidiary of Simon Property Group, Inc. In this report, the terms "Operating Partnership", "we", "us" and "our" refer to Simon Property Group, L.P. and its subsidiaries and the term "Simon Property" refers specifically to Simon Property Group, Inc.

            We own, develop and manage retail real estate properties, which consist primarily of regional malls, Premium Outlets®, The Mills®, and community/lifestyle centers. As of December 31, 2010, we owned or held an interest in 338 income-producing properties in the United States, which consisted of 161 regional malls, 58 Premium Outlets, 66 community/lifestyle centers, 36 properties acquired in the 2007 acquisition of The Mills Corporation and 17 other shopping centers or outlet centers in 41 states and Puerto Rico. Of the 36 properties in The Mills portfolio, 16 of these properties are The Mills, 16 are regional malls, and four are community centers. Internationally, as of December 31, 2010, we had ownership interests in 45 European shopping centers in Italy, eight Premium Outlets in Japan, one Premium Outlet in Mexico, and one Premium Outlet in South Korea. On July 15, 2010, we and our joint venture partner sold our collective interests in Simon Ivanhoe S.à.r.l., or Simon Ivanhoe, which owned seven shopping centers located in France and Poland.

            For a description of our operational strategies and developments in our business during 2010, see the "Management's Discussion and Analysis of Financial Condition and Results of Operations" which appears in Item 7 to this Form 10-K.

Other Policies

            The following is a discussion of our investment policies, financing policies, conflict of interest policies and policies with respect to certain other activities. One or more of these policies may be amended or rescinded from time to time by Simon Property without a vote by our limited partners.

Investment Policies

            While we emphasize equity real estate investments, we may invest in equity or debt securities of other entities engaged in real estate activities or securities of other issuers consistent with Simon Property's qualification as a real estate investment trust, or REIT. However, any of these investments would be subject to the percentage ownership limitations and gross income tests necessary for REIT qualification. These REIT limitations mean that we cannot make an investment that would cause Simon Property's real estate assets to be less than 75% of its total assets. In addition, at least 75% of Simon Property's gross income must be derived directly or indirectly from investments relating to real property or mortgages on real property, including "rents from real property," dividends from other REITs and, in certain circumstances, interest from certain types of temporary investments. At least 95% of Simon Property's income must be derived from such real property investments, and from dividends, interest and gains from the sale or dispositions of stock or securities or from other combinations of the foregoing.

            Subject to REIT limitations, we may invest in the securities of other issuers in connection with acquisitions of indirect interests in real estate. Such an investment would normally be in the form of general or limited partnership or membership interests in special purpose partnerships and limited liability companies that own one or more properties. We may, in the future, acquire all or substantially all of the securities or assets of other REITs, management companies or similar entities where such investments would be consistent with our investment policies.

Financing Policies

            We must comply with the covenants contained in our financing agreements that limit our ratio of debt to total assets or market value, as defined. For example, our lines of credit and the indentures for our debt securities contain covenants that restrict the total amount of debt to 65%, or 60% in relation to certain debt, of total assets, as defined under the related arrangement, and secured debt to 50% of total assets. In addition, these agreements contain other covenants requiring compliance with financial ratios. Furthermore, the amount of debt that we may incur is limited as a practical matter by our desire to maintain acceptable ratings for Simon Property's equity securities and our debt securities. We strive to maintain investment grade ratings on our debt securities at all times, but we cannot assure you that we will be able to do so.

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            We may raise additional capital by issuing units of limited partnership interests, or units, or debt securities, creating joint ventures with existing ownership interests in properties, retaining cash flows or a combination of these methods. If Simon Property's Board of Directors determines to raise additional equity capital at the Operating Partnership level, we may, without limited partner approval, issue additional units or other equity interests in us. We may issue units in any manner and on such terms and for such consideration as we deem appropriate. This may include issuing units in exchange for property. We may issue preferred units that could be senior to our units and may be convertible into units. Existing holders of units have no preemptive right to purchase units in any subsequent offerings. Any such offering could dilute a limited partner's investment in us.

            We expect most future borrowings would be made in the form of bank borrowings, publicly and privately placed debt instruments, or purchase money obligations to the sellers of properties. Any such indebtedness may be secured or unsecured. Any such indebtedness may also have full or limited recourse to the borrower or cross-collateralized with other debt, or may be fully or partially guaranteed by us. Although we may borrow to fund the payment of distributions, we currently have no expectation that we will regularly be required to do so.

            We have a $3.9 billion unsecured revolving credit facility, or the Credit Facility. The Credit Facility has an accordion feature allowing the maximum borrowing capacity to expand to $4.0 billion. We also issue debt securities, and we may issue our debt securities which may be convertible into units, preferred units or be accompanied by warrants to purchase equity interests or be exchangeable for stock of Simon Property. We also may sell or securitize our lease receivables. The proceeds from any borrowings or financings may be used for one or more of the following:

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financing acquisitions;

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developing or redeveloping properties;

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refinancing existing indebtedness;

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working capital or capital improvements; or

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assisting Simon Property to meet the income distribution requirements applicable to REITs.

            We may also finance acquisitions through the following:

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issuance of additional units or preferred units;

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issuance of other securities; or

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sale or exchange of ownership interests in properties.

            Our ability to issue units to transferors of properties or other partnership interests may defer gain recognition for tax purposes by the transferor. It may also be advantageous for us since there are ownership limits that restrict the number of units that investors may own.

            We do not have a policy limiting the number or amount of mortgages that may be placed on any particular property. Mortgage financing instruments, however, usually limit additional indebtedness on such properties. We also have covenants on our unsecured debt that limit our total secured debt.

            Typically, we invest in or form special purpose entities to assist us in obtaining permanent financing at attractive terms. Permanent financing may be structured as a mortgage loan on a single property, or on a group of properties, and generally requires us to provide a mortgage interest on the property in favor of an institutional third party, as a joint venture with a third party, or as a securitized financing. For securitized financings, we create special purpose entities to own the properties. These special purpose entities, which are common in the real estate industry, are structured so that they would not be consolidated in a bankruptcy proceeding involving a parent company. We decide upon the structure of the financing based upon the best terms then available to us and whether the proposed financing is consistent with our other business objectives. For accounting purposes, we include the outstanding securitized debt of special purpose entities owning consolidated properties as part of our consolidated indebtedness.

Conflict of Interest Policies

            We maintain policies and have entered into agreements designed to reduce or eliminate potential conflicts of interest. Simon Property has adopted governance principles governing the function, conduct, selection, orientation and duties of its subsidiaries and the Simon Property Board of Directors, as well as written charters for each of the standing Committees of the Board of Directors. In addition, the Board of Directors of Simon Property has a Code of Business Conduct and Ethics, which applies to all of its officers, directors, and employees. At least a majority of the members of the Simon Property Board of Directors must qualify as independent under the listing standards for New York Stock Exchange companies and cannot be affiliated with the Simon family who are significant stockholders. Any transaction

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between us and the Simons, including property acquisitions, service and property management agreements and retail space leases, must be approved by a majority of Simon Property's non-affiliated directors.

            The sale of certain of our properties may have an adverse tax impact on the Simons or the other limited partners. In order to avoid any conflict of interest between Simon Property and our limited partners, the Simon Property charter requires that at least six of the non-affiliated directors of the Board of Directors must authorize and require us to sell any property we own. Any such sale is subject to applicable agreements with third parties. Noncompetition agreements executed by each of the Simons contain covenants limiting the ability of the Simons to participate in certain shopping center activities in North America.

Policies With Respect To Certain Other Activities

            We intend to make investments which are consistent with Simon Property's qualification as a REIT; unless the Board of Directors determines that it is no longer in Simon Property's best interests to so qualify as a REIT. The Board of Directors may make such a determination because of changing circumstances or changes in the REIT requirements. We have authority to offer units of equity interest or other securities in exchange for property. We also have authority to repurchase or otherwise reacquire our units or any other securities. Our policy prohibits us from making any loans to the directors or executive officers of Simon Property for any purpose. We may make loans to the joint ventures in which we participate.

Competition

            The retail industry is dynamic and competitive. We compete with numerous merchandise distribution channels including regional malls, outlet centers, community/lifestyle centers, and other shopping centers in the United States and abroad. Internet retailing sites and catalogs also provide retailers with distribution options beyond existing brick and mortar retail properties. The existence of competitive alternatives could have a material adverse effect on our ability to lease space and on the level of rents we can obtain. This results in competition for both the tenants to occupy the properties that we develop and manage as well as for the acquisition of prime sites (including land for development and operating properties). We believe that there are numerous factors that make our properties highly desirable to retailers including:

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the quality, location and diversity of our properties;

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our management and operational expertise;

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our extensive experience and relationships with retailers and lenders; and

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our mall marketing initiatives and consumer focused strategic corporate alliances.

Certain Activities

            During the past three years, we have:

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issued 4,688,722 units to Simon Property reflecting the exchange of units for common stock of Simon Property;

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issued 14,542,378 units upon the conversion of preferred units;

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issued 647,825 restricted units to Simon Property, net of forfeitures, with respect to the issuance of a like number of restricted shares of common stock of Simon Property issued under The Simon Property Group 1998 Stock Incentive Plan, or the 1998 plan;

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issued 642,639 units to Simon Property in exchange for cash contributed by Simon Property resulting from exercise of stock options under the 1998 plan;

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issued 1,798,469 units for the 2010 acquisition of Prime Outlets Acquisition Company, or Prime;

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redeemed 162,451 units for cash upon the exchange of units by limited partners;

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redeemed all outstanding Series D and Series I preferred units for units;

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issued 11,876,076 units to Simon Property and 2,637,341 units to limited partners as part of quarterly distributions;

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issued 40,250,000 units to Simon Property in exchange for the cash proceeds of public offerings of an equal number of shares of Simon Property common stock;

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entered into our Credit Facility on December 8, 2009 which has a borrowing capacity of $3.9 billion and contains an accordion feature allowing the maximum borrowing capacity to expand to $4.0 billion;

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borrowed a maximum amount of $862.2 million under the Credit Facility; the outstanding amount of borrowings under this facility as of December 31, 2010 was $858.6 million, of which $273.6 million was related to the U.S. dollar equivalent of Yen-denominated borrowings;

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not made loans to other entities or persons, including our officers and directors, other than to certain joint venture properties;

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not invested in the securities of other issuers for the purpose of exercising control, other than certain wholly-owned subsidiaries and to acquire indirect interests in real estate;

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not underwritten securities of other issuers; and

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not engaged in the purchase and sale or turnover of investments for the purpose of trading.

Employees

            At December 31, 2010, we and our affiliates employed approximately 5,900 persons at various properties and offices throughout the United States, of which approximately 2,400 were part-time. Approximately 1,000 of these employees were located at our corporate headquarters in Indianapolis, Indiana and 100 were located at our Premium Outlets offices in Roseland, New Jersey.

Corporate Headquarters

            Our corporate headquarters are located at 225 West Washington Street, Indianapolis, Indiana 46204, and our telephone number is (317) 636-1600.

Available Information

            Our Internet website address is www.simon.com. Our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act are available or may be accessed free of charge through the "About Simon/Investor Relations/Financial Information" section of our Internet website as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. Our Internet website and the information contained therein or connected thereto are not intended to be incorporated into this Annual Report on Form 10-K.

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Item 1A.    Risk Factors

            The following factors, among others, could cause our actual results to differ materially from those contained in forward-looking statements made in this Annual Report on Form 10-K and presented elsewhere by our management from time to time. These factors, among others, may have a material adverse effect on our business, financial condition, operating results and cash flows, and you should carefully consider them. It is not possible to predict or identify all such factors. You should not consider this list to be a complete statement of all potential risks or uncertainties and we may update them in our future periodic reports.

Risks Relating to Debt and the Financial Markets

We have a substantial debt burden that could affect our future operations.

            As of December 31, 2010, our consolidated mortgages and other indebtedness, excluding the related premium and discount, totaled $17.5 billion. We are subject to the risks normally associated with debt financing, including the risk that our cash flow from operations will be insufficient to meet required debt service. Our debt service costs generally will not be reduced if developments at the property, such as the entry of new competitors or the loss of major tenants, cause a reduction in the income from the property. Should such events occur, our operations may be adversely affected. If a property is mortgaged to secure payment of indebtedness and income from this is insufficient to pay that indebtedness, the property could be foreclosed upon by the mortgagee resulting in a loss of income and a decline in our total asset value.

Disruption in the credit markets or downgrades in our credit ratings may adversely affect our ability to access external financings for our growth and ongoing debt service requirements.

            We depend primarily on external financings, principally debt financings, to fund the growth of our business and to ensure that we can meet ongoing maturities of our outstanding debt. Our access to financing depends on our credit rating, the willingness of banks to lend to us and conditions in the capital markets. We cannot assure you that we will be able to obtain the financing we need for future growth or to meet our debt service as obligations mature, or that the financing available to us will be on acceptable terms.

Adverse changes in our credit rating could affect our borrowing capacity and borrowing terms.

            Our outstanding senior unsecured notes and the preferred stock of Simon Property are periodically rated by nationally recognized credit rating agencies. The credit ratings are based on our operating performance, liquidity and leverage ratios, overall financial position, and other factors viewed by the credit rating agencies as relevant to our industry and the economic outlook in general. Our credit ratings can also affect the amount of capital we can access, as well as the terms of any financing we obtain. Since we depend primarily on debt financing to fund our growth, adverse changes in our credit rating could have a negative effect on our future growth.

Our hedging interest rate protection arrangements may not effectively limit our interest rate risk.

            We manage our exposure to interest rate risk by a combination of interest rate protection agreements to effectively fix or cap a portion of our variable rate debt. In addition, we refinance fixed rate debt at times when we believe rates and terms are appropriate. Our efforts to manage these exposures may not be successful.

            Our use of interest rate hedging arrangements to manage risk associated with interest rate volatility may expose us to additional risks, including a risk that a counterparty to a hedging arrangement may fail to honor its obligations. Developing an effective interest rate risk strategy is complex and no strategy can completely insulate us from risks associated with interest rate fluctuations. There can be no assurance that our hedging activities will have the desired beneficial impact on our results of operations or financial condition. Termination of these hedging agreements typically involves costs, such as transaction fees or breakage costs.

Factors Affecting Real Estate Investments and Operations

We face risks associated with the acquisition, development and expansion of properties.

            We regularly acquire and develop new properties and expand and redevelop existing properties, and these activities are subject to various risks. We may not be successful in pursuing acquisition, development or redevelopment/expansion opportunities. In addition, newly acquired, developed or redeveloped/expanded properties may not perform

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as well as expected. We are subject to other risks in connection with any acquisition, development and redevelopment/expansion activities, including the following:

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construction costs of a project may be higher than projected, potentially making the project unfeasible or unprofitable;

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we may not be able to obtain financing or to refinance construction loans on favorable terms, if at all;

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we may be unable to obtain zoning, occupancy or other governmental approvals;

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occupancy rates and rents may not meet our projections and the project may not be profitable; and

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we may need the consent of third parties such as anchor tenants, mortgage lenders and joint venture partners, and those consents may be withheld.

            If a development or redevelopment/expansion project is unsuccessful, either because it is not meeting our expectations when operational or was not completed according to the project planning, we could lose our investment in the project. Further, if we guarantee the property's financing, our loss could exceed our investment in the project.

Real estate investments are relatively illiquid.

            Our properties represent a substantial portion of our total consolidated assets. These investments are relatively illiquid. As a result, our ability to sell one or more of our properties or investments in real estate in response to any changes in economic or other conditions is limited. If we want to sell a property, we cannot assure you that we will be able to dispose of it in the desired time period or that the sales price of a property will exceed the cost of our investment.

Environmental Risks

As owners of real estate, we can face liabilities for environmental contamination.

            Federal, state and local laws and regulations relating to the protection of the environment may require us, as a current or previous owner or operator of real property, to investigate and clean up hazardous or toxic substances or petroleum product releases at a property or at impacted neighboring properties. These laws often impose liability regardless of whether the property owner or operator knew of, or was responsible for, the presence of hazardous or toxic substances. These laws and regulations may require the abatement or removal of asbestos containing materials in the event of damage, demolition or renovation, reconstruction or expansion of a property and also govern emissions of and exposure to asbestos fibers in the air. Those laws and regulations also govern the installation, maintenance and removal of underground storage tanks used to store waste oils or other petroleum products. Many of our properties contain, or at one time contained, asbestos containing materials or underground storage tanks (primarily related to auto service center establishments or emergency electrical generation equipment). The costs of investigation, removal or remediation of hazardous or toxic substances may be substantial and could adversely affect our results of operations or financial condition but is not estimable. The presence of contamination, or the failure to remediate contamination, may also adversely affect our ability to sell, lease or redevelop a property or to borrow using a property as collateral.

Our efforts to identify environmental liabilities may not be successful.

            Although we believe that our portfolio is in substantial compliance with Federal, state and local environmental laws, ordinances and regulations regarding hazardous or toxic substances, this belief is based on limited testing. Nearly all of our properties have been subjected to Phase I or similar environmental audits. These environmental audits have not revealed, nor are we aware of, any environmental liability that we believe will have a material adverse effect on our results of operations or financial condition. However, we cannot assure you that:

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existing environmental studies with respect to the portfolio reveal all potential environmental liabilities;

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any previous owner, occupant or tenant of a property did not create any material environmental condition not known to us;

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the current environmental condition of the portfolio will not be affected by tenants and occupants, by the condition of nearby properties, or by other unrelated third parties; or

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future uses or conditions (including, without limitation, changes in applicable environmental laws and regulations or the interpretation thereof) will not result in environmental liabilities.

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Retail Operations Risks

Overall economic conditions may adversely affect the general retail environment.

            Our concentration in the retail real estate market means that we are subject to the risks that affect the retail environment generally, including the levels of consumer spending, seasonality, the willingness of retailers to lease space in our shopping centers, tenant bankruptcies, changes in economic conditions, consumer confidence, casualties and other natural disasters, and the potential for terrorist activities. The economy and consumer spending appear to be recovering from the effects of the recent recession. We derive our cash flow from operations primarily from retail tenants, many of whom have been and continue to be under some degree of economic stress. A significant deterioration in our cash flow from operations could require us to curtail planned capital expenditures or seek alternative sources of financing.

We may not be able to lease newly developed properties and renew leases and relet space at existing properties.

            We may not be able to lease new properties to an appropriate mix of tenants or for rents that are consistent with our projections. Also, when leases for our existing properties expire, the premises may not be relet or the terms of reletting, including the cost of allowances and concessions to tenants, may be less favorable than the current lease terms. To the extent that our leasing plans are not achieved, our cash generated before debt repayments and capital expenditures could be adversely affected.

Some of our properties depend on anchor stores or major tenants to attract shoppers and could be adversely affected by the loss of or a store closure by one or more of these tenants.

            Regional malls are typically anchored by department stores and other large nationally recognized tenants. The value of some of our properties could be adversely affected if these tenants fail to comply with their contractual obligations, seek concessions in order to continue operations, or cease their operations. Department store and larger store, also referred to as "big box", consolidations typically result in the closure of existing stores or duplicate or geographically overlapping store locations. We do not control the disposition of those department stores or larger stores that we do not own. We also may not control the vacant space that is not re-leased in those stores we do own. Other tenants may be entitled to modify the terms of their existing leases in the event of such closures. The modification could be unfavorable to us as the lessor and could decrease rents or expense recovery charges. Additionally, major tenant closures may result in decreased customer traffic which could lead to decreased sales at other stores. If the sales of stores operating in our properties were to decline significantly due to closing of anchors, economic conditions, or other reasons, tenants may be unable to pay their minimum rents or expense recovery charges. In the event of default by a tenant or anchor store, we may experience delays and costs in enforcing our rights as landlord to recover amounts due to us under the terms of our agreements with those parties.

We face potential adverse effects from tenant bankruptcies.

            Bankruptcy filings by retailers occur regularly in the course of our operations. We continually seek to re-lease vacant spaces resulting from tenant terminations. The bankruptcy of a tenant, particularly an anchor tenant, may make it more difficult to lease the remainder of the affected properties. Future tenant bankruptcies could adversely affect our properties or impact our ability to successfully execute our re-leasing strategy.

Risks Relating to Joint Venture Properties

We have limited control with respect to some properties that are partially owned or managed by third parties, which may adversely affect our ability to sell or refinance them.

            As of December 31, 2010, we owned interests in 175 income-producing properties with other parties. Of those, 19 properties are included in our consolidated financial statements. We account for the other 156 properties under the equity method of accounting, which we refer to as joint venture properties. We serve as general partner or property manager for 92 of these 156 properties; however, certain major decisions, such as selling or refinancing these properties, require the consent of the other owners. Of the properties for which we do not serve as general partner or property manager, 55 are in our international joint ventures. The other owners also have other participating rights that we consider substantive for purposes of determining control over the properties' assets. The remaining joint venture properties are managed by third parties. These limitations may adversely affect our ability to sell, refinance, or otherwise operate these properties.

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We guarantee debt or otherwise provide support for a number of joint venture properties.

            Joint venture debt is the liability of the joint venture and is typically secured by a mortgage on the joint venture property. As of December 31, 2010, we had loan guarantees to support $60.7 million of our total $6.6 billion share of joint venture mortgage and other indebtedness. A default by a joint venture under its debt obligations may expose us to liability under a guaranty or letter of credit.

Other Factors Affecting Our Business

Our Common Area Maintenance (CAM) contributions may not allow us to recover the majority of our operating expenses from tenants.

            CAM costs typically include allocable energy costs, repairs, maintenance and capital improvements to common areas, janitorial services, administrative, property and liability insurance costs, and security costs. We historically have used leases with variable CAM provisions that adjust to reflect inflationary increases. We have made a concerted effort to convert our leases to a fixed payment methodology which fixes our tenants' CAM contributions and should in turn reduce the volatility of and limitations on the recoveries we collect from our tenants for the reimbursement of our property operating expenses. However, with respect to both variable and fixed payment methodologies, the amount of CAM charges we bill to our tenants may not allow us to recover all of these operating costs.

We face a wide range of competition that could affect our ability to operate profitably.

            Our properties compete with other retail properties and other forms of retailing such as catalogs and e-commerce websites. Competition may come from regional malls, outlet centers, community/lifestyle centers, and other shopping centers, both existing as well as future development projects. The presence of competitive alternatives affects our ability to lease space and the level of rents we can obtain. New construction, renovations and expansions at competing sites could also negatively affect our properties.

            We also compete with other retail property developers to acquire prime development sites. In addition, we compete with other retail property companies for tenants and qualified management.

Our international expansion may subject us to different or greater risk from those associated with our domestic operations.

            We hold interests in joint venture properties that operate in Italy, Japan, Korea, and Mexico, and an interest in a joint venture property under development in Malaysia. We have a minority investment in two U.K. real estate companies. We may pursue additional expansion opportunities outside the United States. International development and ownership activities carry risks that are different from those we face with our domestic properties and operations. These risks include:

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adverse effects of changes in exchange rates for foreign currencies;

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changes in foreign political and economic environments, regionally, nationally, and locally;

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challenges of complying with a wide variety of foreign laws including corporate governance, operations, taxes, and litigation;

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differing lending practices;

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differences in cultures;

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changes in applicable laws and regulations in the United States that affect foreign operations;

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difficulties in managing international operations; and

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obstacles to the repatriation of earnings and cash.

            Although our international activities currently are a relatively small portion of our business (international properties represented approximately 5.0% of the GLA of all of our properties at December 31, 2010), to the extent that we expand our international activities, these risks could increase in significance which in turn could adversely affect our results of operations and financial condition.

Some of our potential losses may not be covered by insurance.

            We maintain insurance coverage with third party carriers who provide a portion of the coverage for specific layers of potential losses including commercial general liability, fire, flood, extended coverage and rental loss insurance on all of our properties in the United States. The initial portion of coverage not provided by third party carriers is

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either insured through our wholly-owned captive insurance companies, Rosewood Indemnity, Ltd. and Bridgewood Insurance Company, Ltd., and other financial arrangements controlled by us. The third party carrier has, in turn, agreed to provide evidence of coverage for this layer of losses under the terms and conditions of the carrier's policy. A similar policy written through our captive insurance entities also provides initial coverage for property insurance and certain windstorm risks at the properties located in coastal windstorm locations.

            There are some types of losses, including lease and other contract claims, which generally are not insured. If an uninsured loss or a loss in excess of insured limits occurs, we could lose all or a portion of the capital we have invested in a property, as well as the anticipated future revenue it could generate.

            We currently maintain insurance coverage against acts of terrorism on all of our properties in the United States on an "all risk" basis in the amount of up to $1 billion. The current federal laws which provide this coverage are expected to operate through 2014. Despite the existence of this insurance coverage, any threatened or actual terrorist attacks where we operate could adversely affect our property values, revenues, consumer traffic and tenant sales.

Risks Relating to Federal Income Taxes

The failure of either of our two REIT subsidiaries to maintain their qualifications as REITs would have adverse tax consequences to us, our unitholders, and Simon Property.

            Simon Property and two of our subsidiaries have elected to qualify as a REIT. Qualification as a REIT for federal income tax purposes is governed by highly technical and complex provisions for which there are only limited judicial or administrative interpretations. If either of the REIT subsidiaries fails to comply with those provisions, and if available relief provisions do not apply:

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The REIT subsidiary will not be allowed a deduction for distributions to us in computing its taxable income;

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The REIT subsidiary will be subject to corporate level income tax, including any applicable alternative minimum tax, on its taxable income at regular corporate rates;

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Unless entitled to relief under relevant statutory provisions, the REIT subsidiary will also be disqualified from treatment as a REIT for the four taxable years following the year during which qualification was lost; and

•

Simon Property would also fail to qualify as a REIT as a result of the REIT subsidiary's failure and the same adverse consequences would apply to it and its stockholders.

            As a result, net income and funds available for distribution to our unitholders would be reduced for those years in which a REIT subsidiary fails to qualify as a REIT. Although we currently intend to operate the REIT subsidiaries so as to qualify each as a REIT, we cannot assure you we will succeed or that future economic, market, legal, tax or other considerations might cause us to revoke the REIT election of either of the REIT subsidiaries.

Item 1B.    Unresolved Staff Comments

            None.

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Item 2.    Properties

United States Properties

            Our U.S. properties primarily consist of regional malls, Premium Outlets, The Mills, community/lifestyle centers, and other properties. These properties contain an aggregate of approximately 250.5 million square feet of gross leasable area, or GLA, of which we own approximately 159.5 million square feet. Total estimated retail sales at the properties in 2010 was in excess of $60 billion.

            Regional malls typically contain at least one traditional department store anchor or a combination of anchors and big box retailers with a wide variety of smaller stores connecting the anchors. Additional stores are usually located along the perimeter of the parking area. Our 161 regional malls are generally enclosed centers and range in size from approximately 400,000 to 2.4 million square feet of GLA. Our regional malls contain in the aggregate more than 18,300 occupied stores, including approximately 709 anchors, which are mostly national retailers. For comparative purposes, we separate the information in this section on the 16 regional malls acquired from The Mills Corporation in 2007, or the Mills Regional Malls, from the information on our other regional malls.

            Premium Outlets generally contain a wide variety of designer and manufacturer stores located in open-air centers. Our 58 Premium Outlets range in size from approximately 150,000 to 850,000 square feet of GLA. The Premium Outlets are generally located near major metropolitan areas and tourist destinations including New York City, Los Angeles, Boston, Palm Springs, Orlando, Las Vegas, and Honolulu.

            The Mills generally range in size from 1.0 million to 2.3 million square feet of GLA and are located in major metropolitan areas. They have a combination of traditional mall, outlet center, and big box retailers and entertainment uses. The Mills Regional Malls typically range in size from 800,000 to 1.3 million square feet of GLA and contain a wide variety of national retailers.

            Community/lifestyle centers are generally unenclosed and smaller than our regional malls. Our 66 community/lifestyle centers generally range in size from approximately 100,000 to 950,000 square feet of GLA. Community/lifestyle centers are designed to serve a larger trade area and typically contain anchor stores and other national retail tenants, which occupy a significant portion of the GLA of the center. We also own traditional community shopping centers that focus primarily on value-oriented and convenience goods and services. These centers are usually anchored by a supermarket, discount retailer, or drugstore and are designed to service a neighborhood area. Finally, we own open-air centers adjacent to our regional malls designed to take advantage of the drawing power of the mall.

            We also have interests in 17 other shopping centers or outlet centers. These properties range in size from approximately 85,000 to 1.0 million square feet of GLA, are considered non-core to our business model, and in total represent less than 1% of our total operating income before depreciation and amortization.

            As of December 31, 2010, approximately 94.2% of the owned GLA in regional malls and Premium Outlets and the retail space of the other properties was leased, approximately 93.7% of the owned GLA for The Mills and 90.4% of owned GLA for the Mills Regional Malls was leased, and approximately 91.6% of owned GLA in the community/lifestyle centers was leased.

            We hold a 100% interest in 218 of our properties, effectively control 19 properties in which we have a joint venture interest, and hold the remaining 101 properties through unconsolidated joint venture interests. We are the managing or co-managing general partner or member of 329 properties. Substantially all of our joint venture properties are subject to rights of first refusal, buy-sell provisions, or other sale rights for all partners which are customary in real estate partnership agreements and the industry. Our partners in our joint ventures may initiate these provisions (subject to any applicable lock up or similar restrictions) which will result in either the use of available cash or borrowings to acquire their partnership interest or the disposal of our partnership interest.

            The following property table summarizes certain data for our regional malls and Premium Outlets, The Mills, the Mills Regional Malls and community/lifestyle centers located in the United States, including Puerto Rico, as of December 31, 2010.

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Simon Property Group, L.P. and Subsidiaries

Property Table

U.S. Properties

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FOOTNOTES:

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(1)

This property is managed by a third party.

(2)

Our direct and indirect interests in some of the properties held as joint venture interests are subject to preferences on distributions in favor of other partners or us.

(3)

The date listed is the expiration date of the last renewal option available to the operating entity under the ground lease. In a majority of the ground leases, we have a right of first refusal or the right to purchase the lessor's interest. Unless otherwise indicated, each ground lease listed in this column covers at least 50% of its respective property.

(4)

Joint venture properties accounted for under the equity method.

(5)

Regional Malls—Executed leases for all company-owned GLA in mall stores, excluding majors. Premium Outlets—Executed leases for all company-owned GLA (or total center GLA). Community/Lifestyle Centers—Executed leases for all company-owned GLA including majors and mall stores.

(6)

Indicates anchor or major that is currently under development.

(7)

Indicates ground lease covers less than 50% of the acreage of this property.

(8)

Indicates vacant anchor space(s).

(9)

The lease at the Mall at Chestnut Hill includes the entire premises including land and building.

(10)

Indicates ground lease covers outparcel only.

(11)

Indicates vacant anchor owned by another company, but we still collect rent and/or fees under an agreement.

(12)

We receive substantially all the economic benefit of the property due to a preference or advance.

(13)

Outside partner receives substantially all of the economic benefit due to a partner preference.

(14)

We own a mortgage note that encumbers Pheasant Lane Mall that entitles us to 100% of the economics of this property.

(15)

Our indirect ownership interest is through an approximately 76% ownership interest in Kravco Simon Investments.

(16)

Indicates anchor or major tenant has announced its intent to close this location.

(17)

Mall & Freestanding GLA includes office space as follows:

(18)

Property temporarily closed due to flood damage which occurred during May 2010.

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United States Lease Expirations

            The following table summarizes lease expiration data for our regional malls and Premium Outlets located in the United States, including Puerto Rico, as of December 31, 2010. The data does not include information for The Mills, the Mills Regional Malls, or properties we acquired in 2010 in our acquisition of Prime. The data presented does not consider the impact of renewal options that may be contained in leases.

Simon Property Group L.P. and Subsidiaries
U.S. Lease Expirations
Regional Malls and Premium Outlets
As of December 31, 2010

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International Properties

            Our ownership interests in properties outside the United States are primarily owned through joint venture arrangements. However, we have direct minority investments in certain real estate companies within the U.K. as further described below.

European Investments

            Gallerie Commerciali Italia, S.p.A., or GCI, is a fully integrated European retail real estate developer, owner and manager of 45 properties in Italy. At December 31, 2010, we had a 49.0% ownership interest in GCI. Our properties in Italy consist primarily of hypermarket-anchored shopping centers. Substantially all of these properties are anchored by the hypermarket retailer Auchan, who is also our partner in GCI. Certain of the properties in Italy are subject to leaseholds whereby GCI leases all or a portion of the premises from a third party who is entitled to receive substantially all the economic benefits of that portion of the properties. Auchan is one of the two largest hypermarket operators in Europe. These centers comprise over 10.1 million square feet of GLA and were 97.2% leased as of December 31, 2010.

            On July 15, 2010, we and our partner in Simon Ivanhoe, Ivanhoe Cambridge Inc., or Ivanhoe Cambridge, sold our collective interests in Simon Ivanhoe which owned seven shopping centers located in France and Poland to Unibail-Rodamco. The joint venture partners received net consideration of €422.5 million for their interests after the repayment of all joint venture debt, subject to certain post-closing adjustments. Our share of the gain on sale of our interests in Simon Ivanhoe was approximately $281 million. A portion of the proceeds was used to repay the €167.4 million (approximately $215 million) principal balance on the Euro-denominated tranche of our Credit Facility.

            We and Ivanhoe Cambridge have the right to participate with Unibail-Rodamco in the potential development of up to five new retail projects in the Simon Ivanhoe pipeline, subject to customary approval rights. We will own a 25% interest in any of these projects in which we agree to participate.

Other International Investments

            We also hold real estate interests in eight operating joint venture properties in Japan, one operating joint venture property in Mexico, one operating joint venture property and two joint venture properties under development in South Korea, and one joint venture property under development in Malaysia. The eight Japanese Premium Outlets operate in various cities throughout Japan and are held in a joint venture with Mitsubishi Estate Co., Ltd. These centers comprise over 2.5 million square feet of GLA and were 99.8% leased as of December 31, 2010.

            The following summarizes our holdings in these international joint ventures and the underlying countries in which these joint ventures own and operate real estate properties as of December 31, 2010:

            In July 2010, we completed construction and opened a 62,000 square foot expansion at Toki Premium Outlets in Toki, Japan.

            Prior to May 7, 2010 we held a minority interest in Liberty International, PLC, or Liberty, a U.K. Real Estate Investment Trust that operated regional shopping centers and owned other prime retail assets throughout the U.K. Effective May 7, 2010, Liberty completed a demerger in which it was separated into two companies, Capital Shopping Centres Group PLC, or CSCG, and Capital & Counties Properties PLC, or CAPC. Liberty shareholders acquired the same number of shares of CSCG and CAPC as they owned in Liberty. CSCG operates regional shopping centers and is the owner of other retail assets primarily located in the United Kingdom. CAPC is predominantly focused on property investment and development in central London. Our interest in CSCG and CAPC is adjusted to their quoted market price, including a related foreign exchange component. Our interests in CSCG and CAPC are less than 6% of their outstanding shares respectively.

            The following property table summarizes certain data for our properties located in Europe, Japan, Mexico, and Korea at December 31, 2010.

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International Properties

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Simon Property Group, L.P. and Subsidiaries
International Properties

FOOTNOTES:

(1)

All gross leasable area listed in square feet.

(2)

This property is held partially in fee and partially encumbered by a leasehold on the premise which entitles the lessor to the majority of the economics of the portion of the property subject to the leasehold.

(3)

These properties are encumbered by a leasehold on the entire premises which entitles the lessor the majority of the economics of the property.

(4)

GCI owns 100% of the shopping gallery at this center which consists of 177,600 sf of leaseable area. In addition, GCI owns a 40% interest in the retail parks at this center, which consist of 446,900 sf of leasable area.

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Land

            We have direct or indirect ownership interests in approximately 550 acres of land held in the United States for future development.

Sustainability and Energy Efficiency

            Due to the size of our portfolio, we focus on energy efficiency as a core sustainability strategy. Through the continued use of energy conservation practices, energy efficiency projects, and continuous monitoring and reporting, we have reduced our energy consumption at comparable properties every year since 2003. As a result, excluding new developments and expansions, we reduced the electricity usage over which we have direct control by 295 million kWhs since 2003. This represents a 22% percent reduction in electricity usage across a portfolio of comparable properties and reflects an annual value of over $34 million in avoided operating costs. Our documented reduction in greenhouse gas emissions resulting from our energy management efforts is 182,000 metric tons CO2e.

            In 2010, Simon Property was awarded NAREIT's Leader in the Light Award for the sixth year in a row and is the only company to have achieved the Leader in the Light distinction every single year since NAREIT launched the program in 2005. Simon Property was also included in the 2009 Carbon Disclosure Project's Global 500 Carbon Disclosure Leadership Index. The 2009 Carbon Disclosure Leadership Index highlights 50 companies worldwide that have displayed the most professional approach to corporate governance with respect to climate change disclosure practices. Simon Property was the only real estate company to be recognized.

Mortgage Financing on Properties

            The following table sets forth certain information regarding the mortgages and other indebtedness encumbering our properties, and the properties held by our domestic and international joint venture arrangements, and also our unsecured corporate debt. Substantially all of the mortgage and property related debt is nonrecourse to us.

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MORTGAGE AND OTHER DEBT ON PORTFOLIO PROPERTIES

As of December 31, 2010

(Dollars in thousands)

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MORTGAGE AND OTHER DEBT ON PORTFOLIO PROPERTIES

As of December 31, 2010

(Dollars in thousands)

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MORTGAGE AND OTHER DEBT ON PORTFOLIO PROPERTIES

As of December 31, 2010

(Dollars in thousands)

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MORTGAGE AND OTHER DEBT ON PORTFOLIO PROPERTIES

As of December 31, 2010

(Dollars in thousands)

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MORTGAGE AND OTHER DEBT ON PORTFOLIO PROPERTIES

As of December 31, 2010

(Dollars in thousands)

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MORTGAGE AND OTHER DEBT ON PORTFOLIO PROPERTIES

As of December 31, 2010

(Dollars in thousands)

(Footnotes on following page)

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(Footnotes for preceding pages)

(1)

Variable rate loans based on LIBOR plus interest rate spreads ranging from 70 bps to 450 bps. LIBOR as of December 31, 2010 was 0.26%.

(2)

Requires monthly payment of interest only.

(3)

Includes applicable extension available at the Applicable Borrower's option.

(4)

Loans secured by these three properties are cross-collateralized and cross-defaulted.

(5)

We have executed a swap agreement that fixes the interest rate on $200 million of this loan at 4.35%.

(6)

Loans secured by these properties are cross-collateralized and cross-defaulted. Factory Stores of America includes Boaz, Georgetown, Graceville, Lebanon, Nebraska City and Story City.

(7)

Loans secured by these three properties are cross-collateralized and cross-defaulted.

(8)

Loan is secured by The Domain Shopping Center, Palms Crossing, and Shops at Arbor Walk and is cross-collateralized and cross-defaulted.

(9)

Loans secured by these three properties are cross-collateralized.

(10)

Loans secured by these four properties are cross-collateralized.

(11)

Associated with these loans are interest rate swap agreements that effectively fix the interest rate of the loans at the all-in rate presented.

(12)

Variable rate loans based on Yen LIBOR plus interest rate spreads ranging from 35 bps to 187.5 bps. Yen LIBOR as of December 31, 2010 was 0.1263%.

(13)

Lender also participates in a percentage of certain gross receipts above a specified base. This threshold was met and additional interest was paid in 2010.

(14)

Requires semi-annual payments of interest only.

(15)

$3,900,000 Credit Facility. As of December 31, 2010, the Credit Facility bears interest at LIBOR+210 basis points and provides for different pricing based upon our investment grade rating. As of December 31, 2010, $3.0 billion was available after outstanding borrowings and letter of credits.

(16)

Amounts shown in USD equivalent. Euro equivalent is 709.1 million. Associated with these loans are interest rate swap agreements with a total combined Euro 587.7 million notional amount that effectively fixes Facility A and B, Giugliano, and a portion of Cinisello at 4.88%.

(17)

Amounts shown in USD equivalent. Won Equivalent is 79,228.0 million.

(18)

LIBOR+1.780%, with LIBOR capped at 4.000%.

(19)

Redeemable beginning 3/30/11, pricing re-sets every 5 years based on an index of LIBOR+2.45%.

(20)

Loans secured by these four properties are cross-collateralized and cross-defaulted.

(21)

Loans secured by these ten properties are cross-collateralized and cross-defaulted.

(22)

LIBOR+3.000%, with LIBOR capped at 8.500%.

(23)

Our share of indebtedness for joint ventures excludes our share of indebtedness of $146.4 million in joint venture entities in which GCI holds a non-controlling interest.

(24)

Through an interest rate floor agreement, the LIBOR rate is currently fixed at 1.50%.

(25)

The maturity date shown represents the anticipated maturity date of the loan which is typically 10-20 years earlier than the stated Maturity Date of the loan. Should the loan not be repaid at the anticipated repayment date the applicable interest rate shall increase as specified in the loan agreement.

(26)

Amounts shown in US Dollar Equivalent. Yen equivalent 35,330.3 million

(27)

LIBOR+0.870%, with LIBOR capped at 4.000%.

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(28)

Through an interest rate floor agreement, the LIBOR rate is currently fixed at 1.00%.

(29)

LIBOR+1.950%, with LIBOR capped at 6.00%.

(30)

LIBOR+4.500%, with LIBOR capped at 8.250%. Through an interest rate floor agreement, the LIBOR rate is currently fixed at 1.00%.

(31)

Variable rate loans based on 91 Day Korea CD rate plus interest rate spreads ranging from 290 bps to 340 bps. The 91 Day Korea CD rate as of December 31, 2010 was 2.80%.

(32)

Senior note was paid off on 1/20/11.

(33)

Amounts shown in US Dollar Equivalent. Balances include borrowings on multi-currency tranche of Yen 22,265.0 million.

(34)

Loans secured by these three properties are cross-collateralized and cross-defaulted.

(35)

Loans secured by these four properties are cross-collateralized and cross-defaulted.

(36)

Loans secured by these two properties are cross-collateralized and cross-defaulted.

(37)

Loans secured by these three properties are cross-collateralized.

(38)

We have executed a swap agreement that fixes the interest rate on $245 million of this loan at 6.26%.

(39)

Loans secured by these three properties are cross-collateralized.

(40)

Senior note was paid off on 2/1/11.

The changes in consolidated mortgages and other indebtedness for the years ended December 31, 2010, 2009, 2008 are as follows:

Item 3.    Legal Proceedings

            We are involved from time-to-time in various legal proceedings that arise in the ordinary course of our business, including, but not limited to commercial disputes, environmental matters, and litigation in connection with transactions including acquisitions and divestitures. We believe that such litigation, claims and administrative proceedings will not have a material adverse impact on our financial position or our results of operations. We record a liability when a loss is considered probable and the amount can be reasonably estimated.

Item 4.    [Removed and Reserved.]

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Part II

Item 5.    Market for the Registrant's Common Equity, Related Stockholder Matters, and Issuer Purchases of Equity Securities

Market Information

            There is no established trading market for our units or preferred units. The following table sets forth for the periods indicated, the distributions declared on our units:

Holders

            The number of holders of record of units was 266 as of February 25, 2011.

Distributions

            We make distributions on our units in order to maintain Simon Property's qualification as a REIT. Simon Property is required each year to distribute to its stockholders at least 90% of its taxable income after certain adjustments. Future distributions will be determined at the discretion of Simon Property's Board of Directors based on actual results of operations, cash available for distribution, and what may be required to maintain Simon Property's status as a REIT.

            On February 3, 2011, Simon Property's Board of Directors approved a quarterly common stock dividend of $0.80 per share, payable all in cash. The distribution rate on our units is equal to the dividend rate on Simon Property's common stock. Distributions during 2010 aggregated $2.60 per unit and were paid entirely in cash. Distributions during 2009, which aggregated to $2.70 per unit, were paid in a combination of cash and units.

Unregistered Sales of Equity Securities

            We did not issue any equity securities that were not required to be registered under the Securities Act of 1933, as amended, during the fourth quarter of 2010.

Temporary Equity

            Holders of the Series I preferred units had the right to convert their Series I preferred units into units or exchange the preferred units for shares of Simon Property's Series I 6% Convertible Perpetual Preferred Stock from March 31, 2010 until the date the Series I preferred units were redeemed. The conversion right resulted from the closing sale price of Simon Property's common stock exceeding the applicable trigger price per share for a period of 20 trading days in the last 30 trading days of the prior quarter. Each Series I preferred unit was convertible into units at a conversion ratio of .847495.

            On March 17, 2010, we announced that we would redeem all of the outstanding Series I preferred units on April 16, 2010. The redemption price was equal to the liquidation value per unit plus accumulated and unpaid distributions through the redemption date or $50.4917 per unit.

            Through the redemption date of April 16, 2010, we issued 6,670,589 units as a result of the conversion of 7,871,276 Series I preferred units. In addition, we issued 862,292 units to limited partners, as a result of the conversion of 1,017,480 Series I preferred units at a conversion ratio of .847495.

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Item 6.    Selected Financial Data

            The following tables set forth selected financial data. The selected financial data should be read in conjunction with the financial statements and notes thereto and with Management's Discussion and Analysis of Financial Condition and Results of Operations. Other data we believe is important in understanding trends in our business is also included in the tables.

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Item 7.    Management's Discussion and Analysis of Financial Condition and Results of Operations

            You should read the following discussion in conjunction with the consolidated financial statements and notes thereto that are included in this report.

Overview

            Simon Property Group, L.P., is a Delaware limited partnership and the majority-owned subsidiary of Simon Property Group, Inc. In this discussion, the terms "Operating Partnership", "we", "us" and "our" refer to Simon Property Group, L.P. and its subsidiaries and the term "Simon Property" refers specifically to Simon Property Group, Inc.

            We own, develop and manage retail real estate properties, which consist primarily of regional malls, Premium Outlets®, The Mills®, and community/lifestyle centers. As of December 31, 2010, we owned or held an interest in 338 income-producing properties in the United States, which consisted of 161 regional malls, 58 Premium Outlets, 66 community/lifestyle centers, 36 properties acquired in the 2007 acquisition of The Mills Corporation, or the Mills acquisition, and 17 other shopping centers or outlet centers in 41 states and Puerto Rico. Of the 36 properties acquired in the Mills portfolio, 16 of these properties are The Mills, 16 are regional malls, and four are community centers. Internationally, as of December 31, 2010, we had ownership interests in 45 European shopping centers in Italy, eight Premium Outlets in Japan, one Premium Outlet in Mexico, and one Premium Outlet in South Korea. On July 15, 2010, we and our joint venture partner sold our collective interests in Simon Ivanhoe S.à.r.l., or Simon Ivanhoe, which owned seven shopping centers located in France and Poland.

            We generate the majority of our revenues from leases with retail tenants including:

•

Base minimum rents,



•

Overage and percentage rents based on tenants' sales volume, and



•

Recoveries of substantially all of our recoverable expenditures, which consist of property operating, real estate taxes, repair and maintenance, and advertising and promotional expenditures.

            Revenues of our management company, after intercompany eliminations, consist primarily of management fees that are typically based upon the revenues of the property being managed.

            We seek growth in earnings, funds from operations, or FFO, and cash flows by enhancing the profitability and operation of our properties and investments. We seek to accomplish this growth through the following:

•

Focusing on leasing to increase revenues and utilizing economies of scale to reduce operating expenses,



•

Expanding and re-tenanting existing franchise locations at competitive market rates,



•

Selectively acquiring high quality real estate assets or portfolios of assets, and



•

Selling non-core assets.

            We also grow by generating supplemental revenue from the following activities:

•

Establishing our malls as leading market resource providers for retailers and other businesses and consumer-focused corporate alliances, including: payment systems (such as handling fees relating to the sales of bank-issued prepaid cards), national marketing alliances, static and digital media initiatives, business development, sponsorship, and events,



•

Offering property operating services to our tenants and others, including waste handling and facility services, and the sale of energy,



•

Selling or leasing land adjacent to our shopping center properties, commonly referred to as "outlots" or "outparcels," and



•

Generating interest income on cash deposits and loans made to related entities.

            We focus on high quality real estate across the retail real estate spectrum. We expand or modernize to enhance profitability and market share of existing assets when we believe the investment of our capital meets our risk-reward criteria. We selectively develop new properties in markets that exhibit strong population and economic growth.

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            We routinely review and evaluate acquisition opportunities based on their ability to complement our portfolio. Our international strategy includes partnering with established real estate companies and financing international investments with local currency to minimize foreign exchange risk.

            To support our growth, we employ a three-fold capital strategy:

•

Provide the capital necessary to fund growth,



•

Maintain sufficient flexibility to access capital in many forms, both public and private, and



•

Manage our overall financial structure in a fashion that preserves our investment grade credit ratings.

Results Overview

            Diluted earnings per unit of limited partnership interest, or units, increased from $1.05 in 2009 to $2.10 in 2010. Significant factors contributing to the year-over-year change included:

•

improved operating performance and core business fundamentals in 2010, coupled with fewer tenant bankruptcies and the recovery of amounts for which we had previously reserved,



•

the effect of our acquisition and expansion activity, including the acquisition of Prime Outlets Acquisition Comapany, or Prime,



•

a gain due to acquisition of controlling interest, sale or disposal of assets and interests in unconsolidated entities, net of $321.0 million, or $0.91 per diluted unit, primarily driven by the sale of our interest in Simon Ivanhoe in the third quarter of 2010,



•

a $350.7 million, or $1.00 per diluted unit, debt extinguishment charge recorded during 2010 related to our two senior unsecured notes tender offers,



•

transaction expenses of $69.0 million, or $0.19 per diluted unit, for costs incurred related to the Prime acquisition, other acquisition-related activities and the settlement of a transaction related dispute,



•

in 2009, a $140.5 million, or $0.44 per diluted unit, other-than-temporary impairment charge related to our investment in Liberty International PLC, or Liberty, due to the significance and duration of the decline in quoted fair value, including related currency exchange component, below the carrying value of the securities,



•

in 2009, a $88.1 million, or $0.27 per diluted unit, net of related tax benefit and noncontrolling interest share, non-cash impairment charge related to three underperforming assets, including one consolidated operating property and two joint venture assets, the write-off of certain predevelopment costs related to projects that we no longer plan to pursue due to economic conditions, and adjustments to carrying values for certain parcels of land, and



•

in 2009, net losses related to the sale of assets and interests in unconsolidated entities of $30.1 million, or $0.09 per diluted unit.

            Core business fundamentals during 2010 improved from the difficult economic environment that existed during 2009. Comparable sales per square foot, or psf, increased to $494 psf, or 9.3%, for our regional malls and Premium Outlets. Average base rents increased 1.0% to $38.87 psf as of December 31, 2010, from $38.47 psf as of December 31, 2009. Leasing spreads remained positive as we were able to lease available square feet at higher rents than the expiring rental rates resulting in a leasing spread of $1.15 psf as of December 31, 2010, representing a 3.0% increase over expiring rents. Occupancy was 94.2% as of December 31, 2010, as compared to 93.4% as of December 31, 2009, an increase of 80 basis points.

            Internationally, on July 15, 2010, we and our partner in Simon Ivanhoe, Ivanhoe Cambridge, Inc., or Ivanhoe Cambridge, sold our collective interests in Simon Ivanhoe which owned seven shopping centers located in France and Poland to Unibail-Rodamco. The joint venture partners received net consideration of €422.5 million for their interests after the repayment of all joint venture debt, subject to certain post-closing adjustments. Our share of the gain on sale of our interests in Simon Ivanhoe was approximately $281 million. A portion of the proceeds was used to repay the €167.4 million (approximately $215 million) principal balance on the Euro-denominated tranche of our $3.9 billion unsecured revolving credit facility, or the Credit Facility.

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            Our effective overall borrowing rate at December 31, 2010 decreased four basis points to 5.58% as compared to 5.62% at December 31, 2009. This decrease was primarily due to a $1.3 billion decrease in our portfolio of fixed rate debt ($14.8 billion at December 31, 2010 as compared to $16.1 billion at December 31, 2009) partially offset by an increase in the effective overall borrowing rate on variable rate debt of 74 basis points (1.93% at December 31, 2010 as compared to 1.19% at December 31, 2009). The 74 basis point increase was a result of increased borrowing spreads and LIBOR floors. At December 31, 2010, the weighted average years to maturity of our consolidated indebtedness was approximately 5.9 years as compared to December 31, 2009 of approximately 4.1 years. Our financing activities for the year ended December 31, 2010, included:

•

completing two separate cash tender offers for several outstanding series of senior unsecured notes. The first tender offer was for any and all senior unsecured notes of ten outstanding series with maturity dates ranging from January 2011 to March 2013. The total principal amount of the notes accepted for purchase on January 26, 2010 was approximately $2.3 billion, with a weighted average duration of 2.0 years and a weighted coupon of 5.76%. We purchased the tendered notes with cash on hand and the proceeds from an offering of $2.25 billion of senior unsecured notes which closed on January 25, 2010. The senior notes offering was comprised of $400.0 million of 4.20% notes due 2015, $1.25 billion of 5.65% notes due 2020 and $600.0 million of 6.75% notes due 2040. The weighted average duration of the notes offering was 14.4 years and the weighted average coupon was 5.69%. We reported a $165.6 million loss on extinguishment of debt in the first quarter of 2010 as a result of the tender offer.

•

the second cash tender offer was for any and all unsecured notes of three outstanding series with maturity dates ranging from May 2013 to August 2014. The total principal amount of the notes accepted for purchase on August 17, 2010 was approximately $1.33 billion, with a weighted average duration of 3.5 years and a weighted average coupon of 6.06%. We purchased the tendered notes with cash on hand and the proceeds from an offering of $900.0 million of 4.375% senior unsecured notes which closed on August 16, 2010. The senior notes are due on March 1, 2021. We reported a $185.1 million loss on extinguishment of debt in the third quarter of 2010 as a result of the tender offer.

•

acquiring an outlet center located in Barceloneta, Puerto Rico from Prime on May 13, 2010 subject to an existing $75.2 million variable-rate mortgage, which matures on May 1, 2014 and bears interest at a rate of LIBOR plus 225 basis points with a LIBOR floor of 1.50%.

•

completing the acquisition of Prime on August 30, 2010, in which we acquired an additional 20 outlet centers subject to existing mortgage loans of approximately $1.2 billion which bear interest at fixed rates ranging from 5.51% to 6.01% and mature at various dates throughout 2016.

•

increasing our borrowings on our Credit Facility to $858.6 million during the year ended December 31, 2010.

•

redeeming a $300.0 million maturing unsecured note which had a fixed rate of 4.875%.

•

redeeming a $400.0 million maturing unsecured note which had a fixed rate of 4.60%.

•

redeeming a $400.0 million maturing unsecured note which had a fixed rate of 4.875%.

•

unencumbering five properties by repaying $1.1 billion in mortgage loans with a weighted average interest rate of 4.35%.

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United States Portfolio Data

            The portfolio data discussed in this overview includes the following key operating statistics: occupancy; average base rent per square foot; and comparable sales per square foot for our domestic assets. We include acquired properties in this data beginning in the year of acquisition and remove properties sold in the year disposed. For comparative purposes, we separate the information below related to community/lifestyle centers, the properties acquired from the Mills Corporation in 2007, or the Mills, from our other U.S. operations. We also do not include any properties located outside of the United States. The following table sets forth these key operating statistics for:

•

properties that are consolidated in our consolidated financial statements,

•

properties we account for under the equity method of accounting as joint ventures, and

•

the foregoing two categories of properties on a total portfolio basis.

            Occupancy Levels and Average Base Rent per Square Foot.    Occupancy and average base rent are based on gross leasable area, or GLA, owned by us in the regional malls, all tenants at the Premium Outlets, all tenants in the Mills portfolio, and all tenants at community/lifestyle centers.

            Comparable Sales per Square Foot.    Comparable sales include total reported retail tenant sales at owned GLA (for mall and freestanding stores with less than 10,000 square feet) in the regional malls and all reporting tenants at the Premium Outlets and the Mills. Retail sales at owned GLA affect revenue and profitability levels because sales determine the amount of minimum rent that can be charged, the percentage rent realized, and the recoverable expenses (common area maintenance, real estate taxes, etc.) that tenants can afford to pay.

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International Property Data

            The following are selected key operating statistics for certain of our international properties.

Critical Accounting Policies

            The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America, or GAAP, requires management to use judgment in the application of accounting policies, including making estimates and assumptions. We base our estimates on historical experience and on various other assumptions believed to be reasonable under the circumstances. These judgments affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenue, and expenses during the reporting periods. If our judgment or interpretation of the facts and circumstances relating to various transactions had been different, it is possible that different accounting policies would have been applied resulting in a different presentation of our financial statements. From time to time, we evaluate our estimates and assumptions. In the event estimates or assumptions prove to be different from actual results, adjustments are made in subsequent periods to reflect more current information. Below is a discussion of accounting policies that we consider critical in that they may require complex judgment in their application or require estimates about matters that are inherently uncertain. For a summary of our significant accounting policies, see Note 3 of the Notes to Consolidated Financial Statements.

•

We, as a lessor, retain substantially all of the risks and benefits of ownership of the investment properties and account for our leases as operating leases. We accrue minimum rents on a straight-line basis over the terms of their respective leases. Substantially all of our retail tenants are also required to pay overage rents based on sales over a stated base amount during the lease year. We recognize overage rents only when each tenant's sales exceed its sales threshold.

•

We review investment properties for impairment on a property-by-property basis whenever events or changes in circumstances indicate that the carrying value of investment properties may not be recoverable. These circumstances include, but are not limited to, declines in cash flows, occupancy and comparable sales per square foot at the property. We measure any impairment of investment property when the estimated undiscounted operating income before depreciation and amortization plus its residual value is less than the carrying value of the property. To the extent impairment has occurred, we charge to income the excess of carrying value of the property over its estimated fair value. We may decide to sell properties that are held for use and the sale prices of these properties may differ from their carrying values. We also review our investments including investments in unconsolidated entities if events or circumstances change indicating that the carrying amount of our investments may not be recoverable. We will record an impairment charge if we determine that a decline in the fair value of the investments below carrying value is other-than-temporary.

•

To maintain Simon Property's qualification as a REIT under the Internal Revenue Code, Simon Property is required to distribute at least 90% of its taxable income in any given year and meet certain asset and income tests. Simon Property monitors its business and transactions that may potentially impact its REIT status. In the unlikely event that Simon Property fails to maintain its REIT status, and available relief provisions do not apply, then it would be required to pay federal income taxes at regular corporate income tax rates during the period it did not qualify as a REIT. If Simon Property lost its REIT status, it could not elect to be taxed as a REIT for four years unless its failure was due to reasonable cause and certain other conditions were met. As a result, failing to maintain REIT status would result in a significant increase in the income tax expense

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recorded during those periods. This could adversely impact our ability to sell our debt securities and Simon Property's ability to sell its securities in the capital markets. We make distributions to our unitholders including Simon Property so that Simon Property can meet the REIT qualification requirements.

•

We make estimates as part of our allocation of the purchase price of acquisitions to the various components of the acquisition based upon the fair value of each component. The most significant components of our allocations are typically the allocation of fair value to the buildings as-if-vacant, land and market value of in-place leases. In the case of the fair value of buildings and the allocation of value to land and other intangibles, our estimates of the values of these components will affect the amount of depreciation we record over the estimated useful life of the property acquired or the remaining lease term. In the case of the market value of in-place leases, we make our best estimates of the tenants' ability to pay rents based upon the tenants' operating performance at the property, including the competitive position of the property in its market as well as sales psf, rents psf, and overall occupancy cost for the tenants in place at the acquisition date. Our assumptions affect the amount of future revenue that we will recognize over the remaining lease term for the acquired in-place leases.

•

A variety of costs are incurred in the development and leasing of properties. After determination is made to capitalize a cost, it is allocated to the specific component of a project that is benefited. Determination of when a development project is substantially complete and capitalization must cease involves a degree of judgment. The costs of land and buildings under development include specifically identifiable costs. The capitalized costs include pre-construction costs essential to the development of the property, development costs, construction costs, interest costs, real estate taxes, salaries and related costs and other costs incurred during the period of development. We consider a construction project as substantially completed and held available for occupancy and cease capitalization of costs upon opening.

Results of Operations

            In addition to the activity discussed above in "Results Overview", the following acquisitions, dispositions, and property openings affected our consolidated results from continuing operations in the comparative periods:

•

During 2010, we disposed of one regional mall, one community center, and one other retail property.

•

On August 30, 2010, we completed our previously announced transaction to acquire 21 outlet centers from Prime, including a center located in Puerto Rico, which was acquired on May 13, 2010.

•

On August 1, 2010, we acquired a controlling interest in a regional mall.

•

During 2009, we disposed of one regional mall and three community centers.

•

On August 6, 2009, we opened Cincinnati Premium Outlets, a 400,000 square foot outlet center located in Warren County, Ohio, north of Cincinnati.

•

On April 23, 2009, we opened The Promenade at Camarillo Premium Outlets, a 220,000 square foot expansion located in Ventura County, north of Los Angeles.

•

On November 13, 2008, we opened Jersey Shore Premium Outlets, a 435,000 square foot outlet center with 120 designer and name-brand outlet stores located in Tinton Falls, New Jersey.

•

On November 6, 2008, we opened the second phase of Orlando Premium Outlets, a 114,000 square foot expansion that is 100% leased and adds 40 new merchants, located in Orlando, Florida.

•

On May 1, 2008, we opened Pier Park, a 900,000 square foot, open-air retail center located in Panama City, Florida.

•

On March 27, 2008, we opened Houston Premium Outlets, a 427,000 square foot outlet center located approximately 30 miles west of Houston in Cypress, Texas.

            In addition to the activities discussed above and in "Results Overview", the following acquisitions, dispositions, and property openings affected our income from unconsolidated entities in the comparative periods:

•

During 2010, we disposed of one other retail property.

•

On July 15, 2010, we and our partner in Simon Ivanhoe, Ivanhoe Cambridge, sold our collective interests in Simon Ivanhoe which owned seven shopping centers located in France and Poland to Unibail-Rodamco.

•

On May 28, 2010, we acquired an additional interest of approximately 19% in Houston Galleria, located in Houston, Texas thereby increasing our interest from 31.5% to 50.4%.

•

On April 29, 2010, Gallerie Commerciali Italia, or GCI, one of our European joint ventures in which we hold a 49% ownership interest, sold its 40% interest in Porta di Roma for €71 million.

•

On March 25, 2010, GCI opened Catania, a 642,000 square foot shopping center in Sicily, Italy.

•

On March 2, 2010, GCI opened Argine, a 300,000 square foot shopping center in Naples, Italy.

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•

During 2009, we recognized a loss on our joint venture interests in our shopping centers in China. We sold our interests to affiliates of our Chinese partner for approximately $29 million, resulting in a loss of approximately $20 million.

•

On July 9, 2009, Chelsea Japan Company, Ltd., or Chelsea Japan, the joint venture which operates the Japanese Premium Outlets in which we have a 40% ownership interest, opened Ami Premium Outlets located in Ami, Japan.

•

On December 30, 2008, Cincinnati Mills, one of the properties we acquired in the Mills acquisition, was sold. We held a 50% interest the shopping center.

•

On October 16, 2008, Chelsea Japan, opened Sendai-Izumi Premium Outlets located in Izumi Park Town, Japan. We hold a 40% ownership interest in Chelsea Japan.

•

On August 25, 2008, GCI opened Monza, a 211,600 square foot shopping center in Monza, Italy.

•

On June 5, 2008, we opened Changshu In City Plaza, a 487,000 square foot retail center located in Changshu, China. We held a 32.5% ownership interest in this center which was sold as part of the disposition of our interests in China.

•

On May 2, 2008, we opened Hamilton Town Center, a 950,000 square foot open-air retail center in Noblesville, Indiana. We hold a 50% ownership interest in this center.

            For the purposes of the following comparisons between the years ended December 31, 2010 and 2009 and the years ended December 31, 2009 and 2008, the above transactions are referred to as the property transactions. In the following discussions of our results of operations, "comparable" refers to properties open and operating throughout both the current and prior year.

            During 2010, we disposed of three consolidated properties that had an aggregate carrying value net of any related debt obligations of $0.1 million for aggregate sales proceeds of $5.8 million, resulting in a net gain of $5.7 million. The gain on disposition of these properties recognized in the consolidated statements of operations and the operating results of the properties that we sold or disposed of during 2010 were not significant to our consolidated results of operations. The following lists those consolidated properties we disposed of and the date of disposition:

            During 2009, we disposed of four consolidated properties that had an aggregate net book value of $13.7 million for aggregate sales proceeds of $3.9 million, resulting in a net loss of $9.8 million. The loss on disposition of these assets recognized in the consolidated statements of operations and the operating results of the properties that we sold or disposed of during 2009 were not significant to our consolidated results of operations. The following lists those consolidated properties we disposed of and the date of disposition:

            In 2008 we had no consolidated property dispositions.

Year Ended December 31, 2010 vs. Year Ended December 31, 2009

            Minimum rents increased $112.7 million during the 2010 period, due to a $80.9 million increase attributable to the property transactions and an increase in comparable rents of $31.8 million, or 1.4%. The increase in comparable minimum rents was primarily attributable to a $33.8 million increase in base minimum rents and a $6.5 million increase in comparable rents from carts, kiosks, and other temporary tenants, partially offset by a $4.8 million decline in the fair market value of in-place lease amortization and a $3.7 million decrease in straight-line rents. Overage rents increased $25.7 million, or 30.3%, as a result of an increase in tenant sales for the period as compared to the prior year.

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            Tenant reimbursements increased $21.6 million, due to a $24.5 million increase attributable to the property transactions, offset by a $2.9 million, or 0.3%, decrease in the comparable properties as a result of a decrease in expenditures allocable to tenants paying common area maintenance on a proportionate basis.

            Total other income increased $25.3 million, principally as a result of the result of the following:

•

an increase in lease settlement income of $33.6 million due to a higher number of terminated leases in the period,

•

an increase in interest income of $10.1 million due to an increase in our available cash on deposit,

•

offset by a $12.4 million decrease in land sale activity, and

•

a $6.0 million decrease in net other activity.

            Property operating expenses decreased $11.4 million, or 2.69%, primarily related to lower costs resulting from our cost control and cost reduction initiatives and generally lower cost of utilities. An increase in property operating expenses in the fourth quarter related to the Prime properties was offset by more favorable claims experience by our captive insurance subsidiaries.

            Depreciation and amortization expense decreased $14.8 million due to the impact of the acceleration of depreciation in 2009 for certain properties scheduled for redevelopment, offset by an increase in 2010 of $52.7 million related to the acquisition of the Prime properties and an increase related to openings and expansion activity.

            The provision for credit losses decreased $19.5 million due to a reduction in the number of tenants in default and a decrease in the number of tenants in bankruptcy proceedings compared to the same period in 2009. We also had strong collections of receivables which we had previously established reserves for due to uncertainty of payment.

            During 2010, we incurred $69.0 million in transaction expenses related to acquisitions, potential acquisitions, and the settlement of a transaction related dispute.

            Interest expense increased $35.0 million primarily related to our issuance of unsecured notes totaling $3.2 billion in 2010 and $1.8 billion during 2009 and the result of new or refinanced debt at several properties including debt associated with the Prime acquisition, offset by the purchase of unsecured notes in the January and August 2010 tender offers and mortgage loans which we repaid during the 2010 period.

            During 2010, we incurred a loss on extinguishment of debt of $350.7 million related to the two unsecured note tender offers.

            Income tax expense (benefit) of taxable REIT subsidiaries increased $7.0 million due to the recognition of a $5.8 million tax benefit in 2009 related to the adjustment of the carrying value of our investment in an unconsolidated non-retail real estate entity.

            Income from unconsolidated entities increased $35.7 million primarily due to favorable results of operations over the prior period, the sale of a non-retail building in 2010, a property opening and expansion in Japan, a decrease in the provision for credit losses and interest savings, partially offset by the negative impact to operations of the flood at Opry Mills.

            In 2010, we recognized an $8.2 million impairment charge from an investment in an unconsolidated entity representing the impact of an impairment recorded on an investment property in Italy.

            In 2010, we recorded a gain upon acquisition of a controlling interest and on the sale of interests in unconsolidated entities of $321.0 million primarily due to our share of the gain on the sale of our interest in Simon Ivanhoe, the gain on the acquisition of a controlling interest in a regional mall previously accounted for under the equity method and the gain on sale of Porta di Roma by GCI.

            Preferred unit distribution requirements decreased $29.3 million as a result of the conversion and redemption of the remaining 6% Series I Convertible Perpetual Preferred Units, or Series I preferred units, to units or cash during 2010 and 2009.

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Year Ended December 31, 2009 vs. Year Ended December 31, 2008

            Minimum rents increased $24.9 million in 2009, of which the property transactions accounted for $27.3 million of the increase, offset by a decrease in comparable minimum rents of $2.4 million, or 0.1%. The decrease in comparable minimum rents was primarily attributable to a $15.4 million decline in the fair market value of in-place lease amortization and a $12.6 million decrease in straight-line rents, offset by an increase in minimum rents of $22.8 million and an increase in comparable rents from carts, kiosks, and other temporary tenants of $2.8 million. Overage rents decreased $15.3 million or 15.3%, as a result of a reduction in tenant sales for the period as compared to the prior year.

            Tenant reimbursements decreased $3.7 million, due to a $14.8 million, or 1.4%, decrease in the comparable properties as a result of a decrease in expenditures allocable to tenants paying common area maintenance on a proportionate basis, offset by an $11.1 million increase attributable to the property transactions.

            Management fees and other revenues decreased $8.4 million principally as a result of decreased earned premiums of our wholly-owned captive insurance entities and lower fee revenue due to the reduction in development, leasing and joint venture property refinancing activity.

            Total other income decreased $5.4 million, and was principally the result of the following:

•

a $15.4 million decrease in interest income primarily due to lower reinvestment rates and the lower rate applicable to our variable rate loan facility with SPG-FCM Ventures, LLC, or SPG-FCM, and

•

a $2.3 million decrease in net other activity, partially offset by

•

a $6.5 million increase in land sale activity primarily related to a land sale in the fourth quarter of 2009, and

•

a $5.8 million increase in lease settlement income.

            Property operating expenses decreased $30.2 million, or 6.6%, primarily related to lower utility costs resulting from our cost control and cost reduction initiatives.

            Depreciation and amortization expense increased $28.1 million due to the impact of prior year openings and expansion activity and acceleration of depreciation for certain properties scheduled for redevelopment.

            Repairs and maintenance decreased $16.1 million due to our cost savings efforts.

            Home and regional office expense decreased $34.8 million primarily due to decreased personnel costs attributable to our cost control initiatives and lower incentive compensation levels.

            During 2009, we recognized a non-cash charge of $140.5 million representing an other-than-temporary impairment in the fair value below the carrying value of our minority investment in Liberty. We recorded the charge to earnings due to the significance and duration of the decline in the total share price, including currency revaluations. In addition, we recorded impairment charges in 2009 of $56.9 million related to one regional mall, certain parcels of land and certain predevelopment costs related to projects no longer being pursued. In 2008, we recognized an impairment of $16.5 million primarily representing the write-down of a mall property to its estimated net realizable value and the write-off of predevelopment costs for various development opportunities which we no longer plan to pursue.

            During 2009, we recorded $5.7 million in transaction expenses related to costs associated with acquisition related activities. In accordance with the required adoption of a new accounting pronouncement effective January 1, 2009, all transaction costs are expensed as incurred and are no longer capitalized as a component of acquisition cost as prior accounting guidance permitted.

            Interest expense increased $44.9 million primarily related to our issuance of $500 million of senior unsecured notes on August 11, 2009, $600 million senior unsecured notes on May 15, 2009 and $650 million senior unsecured notes on March 25, 2009, offset by decreased interest expense on our Credit Facility due to the payoff of the U.S. tranche and other property debt refinancings.

            The 2008 period included a loss on extinguishment of debt of $20.3 million in the second quarter of 2008 related to the redemption of $200 million in remarketable debt securities. We extinguished the debt because the remarketing reset base rate was above the rate for 30-year U.S. Treasury securities at the date of redemption.

            Income tax expense of taxable REIT subsidiaries decreased $8.8 million due to the recognition of a $5.8 million tax benefit in 2009 related to the adjustment of the carrying value of our investment in an unconsolidated non-retail real estate entity.

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            Income from unconsolidated entities increased $8.0 million as a result of our 2008 joint venture openings and expansion activity, interest rate savings from favorable interest rates and debt refinancings, and additional depreciation provisions related to the finalization of purchase accounting on asset basis step-ups in the 2008 period associated with the acquisition of Mills, offset by the gain recognized in 2008 from our disposition of an investment holding of non-retail real estate adjacent to one of our regional mall operating properties.

            In 2009, we recognized a $42.7 million impairment charge representing our share of impairment charges recorded by unconsolidated entities and also impairment charges on our investment in certain unconsolidated entities for which we deemed the declines in value below our carrying amount other-than-temporary.

            The loss on sale of assets and interests in unconsolidated entities of $30.1 million in 2009 was the result of the sale of one regional mall, three community centers, and our 32.5% joint venture interests in our shopping centers operating or under development in China.

            Preferred unit distribution requirements decreased $20.5 million as a result of the conversion of preferred units to units during 2008.

Liquidity and Capital Resources

            Because we generate revenues primarily from long-term leases, our financing strategy relies primarily on long-term fixed rate debt. We manage our floating rate debt to be at or below 15-25% of total outstanding indebtedness by negotiating interest rates for each financing or refinancing based on current market conditions. Floating rate debt currently comprises approximately 11.6% of our total consolidated debt at December 31, 2010. We also enter into interest rate protection agreements as appropriate to assist in managing our interest rate risk. We derive most of our liquidity from leases that generate positive net cash flow from operations and distributions of capital from unconsolidated entities that totaled $2.0 billion during 2010. In addition, our Credit Facility provides an alternative source of liquidity as our cash needs vary from time to time.

            Our balance of cash and cash equivalents decreased $3.2 billion during 2010 to $0.8 billion as of December 31, 2010. December 31, 2010 and 2009 balances include $55.3 million and $38.1 million, respectively, related to our co-branded gift card programs, which we do not consider available for general working capital purposes.

            On December 31, 2010, we had available borrowing capacity of approximately $3.0 billion under the Credit Facility, net of outstanding borrowings of $858.6 million and letters of credit of $33.3 million. For the year ended December 31, 2010, the maximum amount outstanding under the Credit Facility was $862.2 million and the weighted average amount outstanding was approximately $580.4 million. The weighted average interest rate was 2.20% for the year ended December 31, 2010.

            We and/or Simon Property also have access to public capital markets and access to private equity from institutional investors at the property level.

            Our business model requires us to regularly access the debt and equity capital markets to raise funds for acquisition and development activity, redevelopment capital, and to refinance maturing debt. We believe we have sufficient cash on hand and availability under our Credit Facility to address our debt maturities and capital needs through 2011.

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            As discussed further in "Financing and Debt" below, we conducted two cash tender offers for several outstanding series of unsecured notes during 2010. On January 12, 2010, we commenced a tender offer to purchase ten outstanding series of notes. We subsequently purchased $2.3 billion of notes on January 26, 2010. The purchase of the notes was primarily funded with proceeds from the sale of $2.25 billion of senior unsecured notes issued on January 25, 2010. Additionally, on August 9, 2010, we commenced a tender offer to purchase three outstanding series of notes. We subsequently purchased $1.33 billion of tendered notes on August 17, 2010. The purchase of the notes was primarily funded with proceeds from the sale of $900.0 million of senior unsecured notes issued on August 16, 2010. As a result of the tenders, we extended the weighted average duration of our senior unsecured notes portfolio from 6.8 years to 7.5 years and slightly decreased the weighted average interest rate.

Loans to SPG-FCM

            As part of the Mills acquisition in 2007, we made loans to SPG-FCM and the Mills which were used by SPG-FCM and Mills to repay loans and other obligations of Mills. As of December 31, 2010 and 2009, the outstanding balance of our remaining loan to SPG-FCM was $651.0 million and $632.0 million, respectively. During 2010, 2009 and 2008, we recorded approximately $9.9 million, $9.3 million and $15.3 million in interest income (net of inter-entity eliminations) related to this loan, respectively. We also recorded fee income, including fee income amortization related to up-front fees on those loans during 2010, 2009 and 2008 of approximately $0.9 million, $3.7 million and $3.1 million (net of inter-entity eliminations), respectively, for providing refinancing services to Mills' properties and SPG-FCM. The loan bears interest at a rate of LIBOR plus 275 basis points and matures on June 8, 2011, and can be extended for one year.

            In conjunction with the Mills acquisition, we acquired a majority interest in two properties in which we previously held a 50% ownership interest (Town Center at Cobb and Gwinnett Place) and as a result we have consolidated these two properties at the date of acquisition.

            In addition to the loans provided to SPG-FCM, we also provide management services to substantially all of the properties in which SPG-FCM holds an interest.

Cash Flows

            Our net cash flow from operating activities and distributions of capital from unconsolidated entities totaled $2.0 billion during 2010. In addition, we had net repayments from our debt financing and repayment activities in 2010 of $2.4 billion and an additional $350.7 million primarily related to premiums paid to par as a result of the cash tender offers for our senior notes. These activities are further discussed below in "Financing and Debt". Also during 2010, we:

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paid unitholder distributions of $910.5 million,

•

paid preferred unit distributions totaling $8.9 million,

•

funded consolidated capital expenditures of $256.3 million (includes development and other costs of $38.7 million, renovation and expansion costs of $96.1 million, and tenant costs and other operational capital expenditures of $121.5 million),

•

funded investments in unconsolidated entities of $193.9 million,

•

redeemed the remaining outstanding shares of Series I preferred units for $11.0 million,

•

invested in six mortgage and mezzanine loans secured by real estate with an aggregate carrying value of $395.9 million at December 31, 2010, and

•

acquired the 21 Prime outlet centers as further discussed in "Acquisitions and Dispositions" below.

            In general, we anticipate that cash generated from operations will be sufficient to meet operating expenses, monthly debt service, recurring capital expenditures, and distributions to partners necessary to maintain Simon Property's REIT qualification on a long-term basis. In addition, we expect to be able to obtain capital for nonrecurring capital expenditures, such as acquisitions, major building renovations and expansions, as well as for scheduled principal maturities on outstanding indebtedness, from:

•

excess cash generated from operating performance and working capital reserves,

•

borrowings on our Credit Facility,

•

additional secured or unsecured debt financing, or

•

additional equity raised in the public or private markets.

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            We expect to generate positive cash flow from operations in 2011, and we consider these projected cash flows in our sources and uses of cash. These cash flows are principally derived from retail tenants, many of whom have been and continue to be under some degree of economic stress. A significant deterioration in projected cash flows from operations could cause us to increase our reliance on available funds from our Credit Facility, curtail planned capital expenditures, or seek other additional sources of financing as discussed above.

Financing and Debt

Unsecured Debt

            Our unsecured debt at December 31, 2010 consisted of approximately $10.0 billion of our senior unsecured notes of and $858.6 million outstanding under our Credit Facility. The Credit Facility has a borrowing capacity of $3.9 billion and contains an accordion feature allowing the maximum borrowing capacity to expand to $4.0 billion. The Credit Facility matures on March 31, 2013. The base interest on the Credit Facility is LIBOR plus 210 basis points and includes a facility fee of 40 basis points. The Credit Facility also includes a money market competitive bid feature, which allows participating lenders to bid on amounts outstanding at then current market rates of interest for up to 50% of amounts available under the facility. As of December 31, 2010, we are in compliance with all of the covenants of our unsecured debt.

            During the year ended December 31, 2010, our borrowings under the Credit Facility increased primarily as a result of the Prime acquisition partially offset by the repayment of €167.4 million (approximately $215 million) principal balance on the Euro-denominated tranche of our Credit Facility on July 23, 2010. The total outstanding balance of the Credit Facility as of December 31, 2010 was $858.6 million, and the maximum outstanding balance during the year ended December 31, 2010 was $862.2 million. During the year ended December 31, 2010, the weighted average outstanding balance on the Credit Facility was approximately $580.4 million. The outstanding balance as of December 31, 2010 includes $273.6 million (U.S. dollar equivalent) of Yen-denominated borrowings.

            On January 12, 2010, we commenced a cash tender offer for any and all senior unsecured notes of ten outstanding series with maturity dates ranging from January 2011 to March 2013. The total principal amount of the notes accepted for purchase on January 26, 2010 was approximately $2.3 billion, with a weighted average duration of 2.0 years and a weighted average coupon of 5.76%. We purchased the tendered notes with cash on hand and the proceeds from an offering of $2.25 billion of senior unsecured notes that closed on January 25, 2010. The senior notes offering was comprised of $400.0 million of 4.20% notes due 2015, $1.25 billion of 5.65% notes due 2020 and $600.0 million of 6.75% notes due 2040. The weighted average duration of the notes offering was 14.4 years and the weighted average coupon was 5.69%. We recorded a $165.6 million charge to earnings in the first quarter of 2010 as a result of the tender offer.

            On March 18, 2010, we repaid a $300.0 million senior unsecured note which had a fixed rate of 4.875%.

            On June 15, 2010, we repaid a $400.0 million senior unsecured note which had a fixed rate of 4.60%.

            On August 9, 2010, we commenced a cash tender offer for any and all senior unsecured notes of three outstanding series with maturity dates ranging from May 2013 to August 2014. The total principal amount of the notes accepted for purchase on August 17, 2010 was approximately $1.33 billion, with a weighted average duration of 3.5 years and a weighted average coupon of 6.06%. We purchased the tendered notes with cash on hand and the proceeds from an offering of $900.0 million of 4.375% senior unsecured notes that closed on August 16, 2010. The senior notes are due on March 1, 2021. We recorded a $185.1 million charge to earnings in the third quarter of 2010 as a result of the tender offer.

            On August 16, 2010, we repaid a $400.0 million senior unsecured note which had a fixed rate of 4.875%.

Secured Debt

            Total secured indebtedness was $6.6 billion at December 31, 2010 and 2009. During the year ended December 31, 2010, we unencumbered five properties by repaying $1.1 billion in mortgage loans with a weighted average interest rate of 4.35%.

            On May 13, 2010, we acquired a property located in Barceloneta, Puerto Rico from Prime subject to an existing $75.2 million mortgage loan. The loan matures on May 1, 2014 and bears interest at LIBOR plus 225 basis points with a LIBOR floor of 1.50%.

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            On August 30, 2010, we completed our acquisition of Prime and assumed existing mortgage loans of approximately $1.2 billion which bear interest at fixed rates ranging from 5.51% and 6.01% and mature at various dates throughout 2016.

Summary of Financing

            Our consolidated debt, adjusted to reflect outstanding derivative instruments, and the effective weighted average interest rates as of December 31, 2010, and 2009, consisted of the following (dollars in thousands):

            As of December 31, 2010, we had $692.5 million of notional amount fixed rate swap agreements that have a weighted average fixed pay rate of 2.79% and a weighted average variable receive rate of 0.51%. As of December 31, 2010, the net effect of these agreements effectively converted $692.5 million of variable rate debt to fixed rate debt.

            Contractual Obligations and Off-balance Sheet Arrangements:    In regards to long-term debt arrangements, the following table summarizes the material aspects of these future obligations on our consolidated indebtedness as of December 31, 2010, and subsequent years thereafter (dollars in thousands) assuming the obligations remain outstanding through initial maturities:

            Our off-balance sheet arrangements consist primarily of our investments in joint ventures which are common in the real estate industry and are described in Note 7 of the notes to the accompanying financial statements. Our joint ventures typically fund their cash needs through secured debt financings obtained by and in the name of the joint venture entity. The joint venture debt is secured by a first mortgage, is without recourse to the joint venture partners, and does not represent a liability of the partners, except to the extent the partners or their affiliates expressly guarantee the joint venture debt. As of December 31, 2010, we had guaranteed $60.7 million of the total joint venture related mortgage or other indebtedness of $6.6 billion then outstanding. We may elect to fund cash needs of a joint venture through equity contributions (generally on a basis proportionate to our ownership interests), advances or partner loans, although such fundings are not required contractually or otherwise.

Preferred Unit Activity

            Holders of the Series I preferred units had the right to convert their Series I preferred units into units or exchange the preferred units for shares of Simon Property's Series I 6% Convertible Perpetual Preferred Stock from March 31, 2010 until the date the Series I preferred units were redeemed. The conversion right resulted from the closing sale price of Simon Property's common stock exceeding the applicable trigger price per share for a period of 20 trading days in the last 30 trading days of the prior quarter. Each Series I preferred unit was convertible into units at a conversion ratio of .847495.

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            On April 16, 2010, we redeemed all of the outstanding Series I preferred units. The redemption price was equal to the liquidation value per unit plus accumulated and unpaid distributions through the redemption date or $50.4917 per unit.

            Through the redemption date, we issued 6,670,589 units as a result of the conversion of 7,871,276 Series I preferred units. In addition, we issued 862,292 units to limited partners as a result of the conversion of 1,017,480 Series I preferred units at a conversion ratio of .847495.

Acquisitions and Dispositions

            Buy-sell provisions are common in real estate partnership agreements. Most of our partners are institutional investors who have a history of direct investment in retail real estate. Our partners in our joint venture properties may initiate these provisions (subject to any applicable lock up or similar restrictions). If we determine it is in our unitholders' best interests for us to purchase the joint venture interest and we believe we have adequate liquidity to execute the purchase without hindering our cash flows, then we may initiate these provisions or elect to buy. If we decide to sell any of our joint venture interests, we expect to use the net proceeds to reduce outstanding indebtedness or to reinvest in development, redevelopment, or expansion opportunities.

            Acquisitions.    During 2010, we acquired a controlling interest in a regional mall which resulted in a remeasurement of our previously held equity interest to fair value and corresponding gain of approximately $13.0 million. This gain is included in gain (loss) upon acquisition of controlling interest and on sale or disposal of assets and interests in unconsolidated entities, net in the accompanying consolidated statements of operations and comprehensive income.

            On May 28, 2010, we acquired an additional interest of approximately 19% in Houston Galleria, located in Houston, Texas thereby increasing our interest from 31.5% to 50.4%.

            On August 30, 2010, we completed our previously announced transaction to acquire 21 outlet centers from Prime, including a center located in Puerto Rico, which was acquired on May 13, 2010. The transaction was valued at approximately $2.3 billion, including the assumption of existing mortgage indebtedness of $1.2 billion and the repayment of $310.7 million of preexisting mortgage loans at closing.

            We paid consideration comprised of 80% cash and 20% in units. We issued approximately 1.7 million units with an issuance date fair value of approximately $154.5 million. We funded the cash portion of this acquisition through draws on our Credit Facility.

            Dispositions.    We continue to pursue the disposition of properties that no longer meet our strategic criteria or that are not the primary retail venue within their trade area. During 2010, we disposed of one regional mall, one community center, two other retail properties, and our interest in eight international joint venture properties for an aggregate net gain of $308.1 million.

Development Activity

            New Domestic Developments.    During 2010, we began construction on Merrimack Premium Outlets located in Merrimack, New Hampshire. This new center, which will be wholly owned by us, is expected to open in the first half of 2012. The estimated cost of this project is $138 million, and the carrying amount of the construction in progress as of December 31, 2010 was $37.6 million. Other than this project, our share of other 2010 new developments was not significant.

            Domestic Expansions and Renovations.    In addition to new development, we incur costs related to construction for significant renovation and expansion projects at our properties. In 2011 we expect to reinstitute our redevelopment and expansion initiatives which were previously reduced given the downturn in the economy. We expect our share of development costs for 2011 related to renovation or expansion initiatives to be approximately $350 million. We expect to fund these capital projects with cash flows from operations.

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Capital Expenditures on Consolidated Properties.

            The following table summarizes total capital expenditures on consolidated properties on a cash basis:

            International Development Activity.    We typically reinvest net cash flow from our international investments to fund future international development activity. We believe this strategy mitigates some of the risk of our initial investment and our exposure to changes in foreign currencies. We have also funded our European investments with Euro-denominated borrowings that act as a natural hedge against local currency fluctuations. This has also been the case with our Premium Outlets in Japan and South Korea where we use Yen and Won denominated financing, respectively. Currently, our consolidated net income exposure to changes in the volatility of the Euro, Yen, Won, Peso and other foreign currencies is not material. We expect our share of international development costs for 2011 will be approximately $90 million, primarily funded through reinvested joint venture cash flow and construction loans.

            In March 2010, two European developments opened, adding approximately 942,000 square feet of GLA for a total net cost of approximately €221 million, of which our share was approximately €53 million, or $64.8 million based on applicable Euro:USD exchange rates. Although we sold our joint venture interest in Simon Ivanhoe, we and Ivanhoe Cambridge have the right to participate with Unibail-Rodamco in the potential development of up to five new retail projects in the Simon Ivanhoe pipeline, subject to customary approval rights. We will own a 25% interest in any of these projects in which we agree to participate.

            On July 14, 2010 Toki Premium Outlets Phase III, a 62,000 square foot expansion to the Toki Premium Outlet located in Toki, Japan, opened to the public. Currently Tosu Premium Outlets Phase III, a 52,000 square foot expansion to the Tosu Premium Outlet located in Fukuoka, Japan, is under construction. The combined projected net cost of these projects is JPY 5.3 billion, of which our share is approximately JPY 2.1 billion, or $25.8 million based on applicable Yen:USD exchange rates.

            Paju Premium Outlets, a 328,000 square foot center located in Seoul, South Korea, is under construction. The projected net cost of this project is KRW 121.2 billion, of which our share is approximately KRW 60.6 billion, or $53.6 million based on applicable KRW:USD exchange rates.

            We have a 50% joint venture investment in Malaysia. Currently, Johor Premium Outlets, a 173,000 square foot center located in Johor, Malaysia is under construction. The projected net cost of this project is MYR 153 million, of which our share is approximately MYR 77 million, or $24.9 million based on applicable MYR:USD exchange rates.

Market Risk

            Our exposure to market risk due to changes in interest rates primarily relates to our long-term debt obligations. We manage exposure to interest rate market risk through our risk management strategy by a combination of interest rate protection agreements to effectively fix or cap a portion of variable rate debt. We are also exposed to foreign currency risk on financings of certain foreign operations. Our intent is to offset gains and losses that occur on the underlying exposures, with gains and losses on the derivative contracts hedging these exposures. We do not enter into either interest rate protection or foreign currency rate protection agreements for speculative purposes.

            We may enter into treasury lock agreements as part of an anticipated debt issuance. If the anticipated transaction does not occur, the cost is charged to consolidated net income. Upon completion of the debt issuance, the cost of these instruments is recorded as part of accumulated other comprehensive income and is amortized to interest expense over the life of the debt agreement.

            Our future earnings, cash flows and fair values relating to financial instruments are dependent upon prevalent market rates of interest, primarily LIBOR. LIBOR was at historically low levels during 2010. Based upon consolidated indebtedness and interest rates at December 31, 2010, a 50 basis point increase in the market rates of interest would

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decrease future earnings and cash flows by approximately $10.0 million, and would decrease the fair value of debt by approximately $374.7 million.

Distributions

            Distributions during 2010 aggregated $2.60 per unit and were paid entirely in cash. Distributions during 2009 aggregated $2.70 per unit and were paid in a combination of cash and units. We must pay a minimum amount of distributions to maintain Simon Property's status as a REIT. Our distributions typically exceed our consolidated net income generated in any given year primarily because of depreciation, which is a "non-cash" expense. Future distributions will be determined by the Simon Property Board of Directors based on actual results of operations, cash available for distributions, cash reserves as deemed necessary for capital and operating expenditures, and the amount required to maintain Simon Property's status as a REIT.

Forward-Looking Statements

            Certain statements made in this section or elsewhere in this report may be deemed "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Although we believe the expectations reflected in any forward-looking statements are based on reasonable assumptions, we can give no assurance that our expectations will be attained, and it is possible that our actual results may differ materially from those indicated by these forward-looking statements due to a variety of risks, uncertainties and other factors. Such factors include, but are not limited to: the impact of a prolonged recession, our ability to meet debt service requirements, the availability and terms of financing, changes in our credit rating, changes in market rates of interest and foreign exchange rates for foreign currencies, the ability to hedge interest rate risk, risks associated with the acquisition, development and expansion of properties, general risks related to retail real estate, the liquidity of real estate investments, environmental liabilities, changes in market rental rates, trends in the retail industry, relationships with anchor tenants, the inability to collect rent due to the bankruptcy or insolvency of tenants or otherwise, risks relating to joint venture properties, competitive market forces, risks related to international activities, insurance costs and coverage, terrorist activities, and maintenance of our status as a real estate investment trust. We discuss these and other risks and uncertainties under the heading "Risk Factors" in this Annual Report on Form 10-K. We may update that discussion in subsequent Quarterly Reports on Form 10-Q, but otherwise we undertake no duty or obligation to update or revise these forward-looking statements, whether as a result of new information, future developments, or otherwise.

Item 7A.    Qualitative and Quantitative Disclosure About Market Risk

            Please refer to the Management's Discussion and Analysis of Financial Condition and Results of Operations included in Item 7 under the caption Liquidity and Capital Resources.

Item 8.    Financial Statements and Supplementary Data

            Reference is made to the Index to Financial Statements contained in Item 15.

Item 9.    Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

            None.

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Item 9A.    Controls and Procedures

            Evaluation of Disclosure Controls and Procedures.    We carried out an evaluation under the supervision and with participation of Simon Property management, including the chief executive officer and chief financial officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of the end of the period covered by this Annual Report on Form 10-K pursuant to Exchange Act Rule 13a-15. Based upon that evaluation, Simon Property management, including the chief executive officer and chief financial officer, concluded that our disclosure controls and procedures were effective as of December 31, 2010.

            Changes in Internal Control Over Financial Reporting.    There was no change in our internal control over financial reporting (as defined in Rule 13a-15(f)) that occurred during the fourth quarter of 2010 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

            Management's Report on Internal Control over Financial Reporting.    We are responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rule 13a-15(f) or 15d-15(f) promulgated under the Securities Exchange Act of 1934 as a process designed by, or under the supervision of, Simon Property's Board of Directors, principal executive and principal financial officers and effected by Simon Property's management and other personnel, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with U.S. generally accepted accounting principles and includes those policies and procedures that:

•

Pertain to the maintenance of records that in reasonable detail accurately and fairly reflect our transactions and disposition of assets;

•

Provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with U.S. generally accepted accounting principles, and that our receipts and expenditures are being made only in accordance with authorizations of our management and directors; and

•

Provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on the financial statements.

            Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

            We assessed the effectiveness of our internal control over financial reporting as of December 31, 2010. In making this assessment, we used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework.

            Based on that assessment, we believe that, as of December 31, 2010, our internal control over financial reporting is effective based on those criteria.

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Report of Independent Registered Public Accounting Firm

The Board of Directors of Simon Property Group, Inc.
and The Partners of Simon Property Group, L.P.:

            We have audited Simon Property Group, L.P. and Subsidiaries' internal control over financial reporting as of December 31, 2010 based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (the COSO criteria). Simon Property Group, L.P. and Subsidiaries' management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management's Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Partnership's internal control over financial reporting based on our audit.

            We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

            A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

            Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

            In our opinion, Simon Property Group, L.P. and Subsidiaries maintained, in all material respects, effective internal control over financial reporting as of December 31, 2010, based on the COSO criteria.

            We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Simon Property Group, L.P. and Subsidiaries as of December 31, 2010 and 2009, and the related consolidated statements of operations and comprehensive income, equity and cash flows for each of the three years in the period ended December 31, 2010 of Simon Property Group, L.P. and Subsidiaries, and the financial statement schedule listed in the Index at Item 15, and our report dated March 11, 2011 expressed an unqualified opinion thereon.

Item 9B.    Other Information

            During the fourth quarter of the year covered by this report, the Audit Committee of Simon Property Group, Inc.'s Board of Directors approved certain non-audit tax compliance services to be provided by Ernst & Young, LLP, Simon Property's independent registered public accounting firm. This disclosure is made pursuant to Section 10A(i)(2) of the Securities Exchange Act of 1934, as added by Section 202 of the Sarbanes-Oxley Act of 2002.

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Part III

Item 10.    Directors, Executive Officers and Corporate Governance

            We are a limited partnership and Simon Property is our sole general partner. We do not have any directors or executive officers or any equity securities registered under the Securities Exchange Act of 1934. Comparable information for Simon Property can be found in its periodic reports and proxy statements it files with the Securities and Exchange Commission.

Item 11.    Executive Compensation

            We are a limited partnership and Simon Property is our sole general partner. We do not have any directors or executive officers or any equity securities registered under the Securities Exchange Act of 1934. Comparable information for Simon Property can be found in its periodic reports and proxy statements it files with the Securities and Exchange Commission.

Item 12.    Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

            We are a limited partnership and Simon Property is our sole general partner. We do not have any directors or executive officers or any equity securities registered under the Securities Exchange Act of 1934. Comparable information for Simon Property can be found in its periodic reports and proxy statements it files with the Securities and Exchange Commission.

Item 13.    Certain Relationships and Related Transactions and Director Independence

            We are a limited partnership and Simon Property is our sole general partner. We do not have any directors or executive officers or any equity securities registered under the Securities Exchange Act of 1934. Comparable information for Simon Property can be found in its periodic reports and proxy statements it files with the Securities and Exchange Commission.

Item 14.    Principal Accountant Fees and Services

            The Audit Committee of Simon Property's Board of Directors pre-approves all audit and permissible non-audit services to be provided by Ernst & Young LLP, or Ernst & Young, our independent registered public accounting firm, prior to commencement of services. The Audit Committee has delegated to the Chairman of the Audit Committee the authority to pre-approve specific services up to specified individual and aggregate fee amounts. These pre-approval decisions are presented to the full Audit Committee at the next scheduled meeting after such approvals are made. We have incurred fees as shown below for services from Ernst & Young as our independent registered public accounting firm. Ernst & Young has advised us that it has billed or will bill these indicated amounts for the following categories of services for the years ended December 31, 2010 and 2009, respectively:

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Part IV

Item 15.    Exhibits and Financial Statement Schedules

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Report of Independent Registered Public Accounting Firm

The Board of Directors of Simon Property Group, Inc.
and The Partners of Simon Property Group, L.P.:

            We have audited the accompanying consolidated balance sheets of Simon Property Group, L.P. and Subsidiaries as of December 31, 2010 and 2009, and the related consolidated statements of operations and comprehensive income, equity and cash flows for each of the three years in the period ended December 31, 2010. Our audit also included the financial statement schedule listed in the Index at Item 15. These financial statements and schedule are the responsibility of the Partnership's management. Our responsibility is to express an opinion on these financial statements and schedule based on our audits.

            We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

            In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Simon Property Group, L.P. and Subsidiaries at December 31, 2010 and 2009, and the consolidated results of their operations and their cash flows for each of the three years in the period ended December 31, 2010, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, the related financial statement schedule, when considered in relation to the basic financial statements taken as a whole, presents fairly in all material respects the information set forth therein.

            We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Simon Property Group, L.P. and Subsidiaries' internal control over financial reporting as of December 31, 2010, based on criteria established in Internal Control — Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated March 11, 2011, expressed an unqualified opinion thereon.

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Simon Property Group, L.P. and Subsidiaries
Consolidated Balance Sheets
(Dollars in thousands, except unit amounts)

The accompanying notes are an integral part of these statements.

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Simon Property Group, L.P. and Subsidiaries
Consolidated Statements of Operations and Comprehensive Income
(Dollars in thousands, except per unit amounts)

The accompanying notes are an integral part of these statements.

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Simon Property Group, L.P. and Subsidiaries
Consolidated Statements of Cash Flows
(Dollars in thousands)

The accompanying notes are an integral part of these statements.

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Simon Property Group, L.P. and Subsidiaries
Consolidated Statements of Equity
(Dollars in thousands)

The accompanying notes are an integral part of these statements.

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Simon Property Group, L.P. and Subsidiaries

Notes to Consolidated Financial Statements

(Dollars in thousands, except unit and per unit amounts and where indicated as in millions or billions)

1.    Organization

            Simon Property Group, L.P. is a Delaware limited partnership and the majority-owned subsidiary of Simon Property Group, Inc. In these notes to consolidated financial statements, the terms "Operating Partnership", "we", "us" and "our" refer to Simon Property Group, L.P., and its subsidiaries and the term "Simon Property" refers to Simon Property Group, Inc. Simon Property is a self-administered and self-managed real estate investment trust, or REIT, under the Internal Revenue Code of 1986, as amended, or the Code. According to our partnership agreement, we are required to pay all expenses of Simon Property.

            We own, develop and manage retail real estate properties, which consist primarily of regional malls, Premium Outlets®, The Mills®, and community/lifestyle centers. As of December 31, 2010, we owned or held an interest in 338 income-producing properties in the United States, which consisted of 161 regional malls, 58 Premium Outlets, 66 community/lifestyle centers, 36 properties acquired in the 2007 acquisition of The Mills Corporation, or the Mills acquisition, and 17 other shopping centers or outlet centers in 41 states and Puerto Rico. Of the 36 properties acquired in the Mills portfolio, 16 of these properties are The Mills, 16 are regional malls, and four are community centers. Internationally, as of December 31, 2010, we had ownership interests in 45 European shopping centers in Italy, eight Premium Outlets in Japan, one Premium Outlet in Mexico, and one Premium Outlet in South Korea. On July 15, 2010, we and our joint venture partner sold our collective interests in Simon Ivanhoe S.à.r.l., or Simon Ivanhoe, which owned seven shopping centers located in France and Poland.

            We generate the majority of our revenues from leases with retail tenants including:

•

Base minimum rents,

•

Overage and percentage rents based on tenants' sales volume, and

•

Recoveries of substantially all of our recoverable expenditures, which consist of property operating, real estate taxes, repair and maintenance, and advertising and promotional expenditures.

            Revenues of our management company, after intercompany eliminations, consist primarily of management fees that are typically based upon the revenues of the property being managed.

            We also generate supplemental revenue from the following activities:

•

Establishing our malls as leading market resource providers for retailers and other businesses and consumer-focused corporate alliances including payment systems (such as handling fees relating to the sales of bank-issued prepaid cards), national marketing alliances, static and digital media initiatives, business development, sponsorship, and events,

•

Offering property operating services to our tenants and others, including waste handling and facility services, and the sale of energy,

•

Selling or leasing land adjacent to our shopping center properties, commonly referred to as "outlots" or "outparcels," and

•

Generating interest income on cash deposits, loans made to related entities and loans held for investment.

2.    Basis of Presentation and Consolidation

            The accompanying consolidated financial statements include the accounts of all majority-owned subsidiaries, and all significant intercompany amounts have been eliminated.

            We consolidate properties that are wholly owned or properties where we own less than 100% but we control. Control of a property is demonstrated by, among other factors, our ability to refinance debt and sell the property without the consent of any other partner or owner and the inability of any other partner or owner to replace us.

            We also consolidate a variable interest entity, or VIE, when we are determined to be the primary beneficiary. On January 1, 2010, we adopted the amendment on the accounting and disclosure requirements for the consolidation of VIEs. This amendment requires an enterprise to perform a qualitative analysis when determining whether or not it must consolidate a VIE. The amendment also requires an enterprise to continuously reassess whether it must

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Simon Property Group, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

(Dollars in thousands, except unit and per unit amounts and where indicated as in millions or billions)

2.    Basis of Presentation and Consolidation (Continued)

consolidate a VIE. Additionally, the amendment requires enhanced disclosures about an enterprise's involvement with VIEs and any significant change in risk exposure due to that involvement, as well as how its involvement with VIEs impacts the enterprise's financial statements. Finally, an enterprise will be required to disclose significant judgments and assumptions used to determine whether or not to consolidate a VIE. The adoption of this amendment did not have a significant impact on our financial position, results of operations, or cash flows.

            Determination of the primary beneficiary of a VIE is based on whether an entity (1) has the power to direct activities that most significantly impact the economic performance of the VIE and (2) has the obligation to absorb losses or the right to receive benefits of the VIE that could potentially be significant to the VIE. Our determination of the primary beneficiary of a VIE considers all relationships between us and the VIE, including management agreements and other contractual arrangements. There have been no changes during 2010 in conclusions about whether an entity qualifies as a VIE or whether we are the primary beneficiary of any previously identified VIE. During 2010, we did not provide financial or other support to a previously identified VIE that we were not previously contractually obligated to provide.

            Investments in partnerships and joint ventures represent our noncontrolling ownership interests in properties. We account for these investments using the equity method of accounting. We initially record these investments at cost and we subsequently adjust for net equity in income or loss, which we allocate in accordance with the provisions of the applicable partnership or joint venture agreement, and cash contributions and distributions. The allocation provisions in the partnership or joint venture agreements are not always consistent with the legal ownership interests held by each general or limited partner or joint venture investee primarily due to partner preferences. We separately report investments in joint ventures for which accumulated distributions have exceeded investments in and our share of net income of the joint ventures within cash distributions and losses in partnerships and joint ventures, at equity in the consolidated balance sheets. The net equity of certain joint ventures is less than zero because of financing or operating distributions that are usually greater than net income, as net income includes non-cash charges for depreciation and amortization.

            As of December 31, 2010, we consolidated 218 wholly-owned properties and 19 additional properties that are less than wholly-owned, but which we control or for which we are the primary beneficiary. We account for the remaining 156 properties, or joint venture properties, using the equity method of accounting. We manage the day-to-day operations of 92 of the 156 joint venture properties, but have determined that our partner or partners have substantive participating rights in regards to the assets and operations of these joint venture properties. Our investments in joint ventures in Europe, Japan, Mexico and Korea comprise 55 of the remaining 64 properties. The international properties are managed by joint ventures in which we share oversight responsibility with our partner. Additionally, we account for our investment in SPG-FCM Ventures, LLC, or SPG-FCM, which acquired The Mills Corporation and its wholly-owned subsidiary, The Mills Limited Partnership, or collectively Mills, in April 2007, using the equity method of accounting. We have determined that SPG-FCM is not a VIE and that Farallon Capital Management, L.L.C., our joint venture partner, has substantive participating rights with respect to the assets and operations of SPG-FCM pursuant to the applicable partnership agreements.

            We allocate our net operating results after preferred distributions based on our partners' respective weighted average ownership. Simon Property owns a majority of our common units of partnership interest, or units, and certain series of our preferred units of partnership interest, or preferred units, which have terms comparable to outstanding shares of Simon Property preferred stock. Simon Property's weighted average ownership interest in us was as follows:

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Table of Contents

Simon Property Group, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

(Dollars in thousands, except unit and per unit amounts and where indicated as in millions or billions)

2.    Basis of Presentation and Consolidation (Continued)