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

FORM 10-Q

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

For the quarterly period ended September 30, 2011

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

Delaware
(State of incorporation or organization)

333-11491
(Commission File No.)

34-1755769
(I.R.S. Employer Identification No.)

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

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

        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 ý    No o

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

        Indicate by check mark whether Registrant is a shell company (as defined by Rule 12b-2 of the Exchange Act). Yes o    No ý

        Registrant has no common stock outstanding.

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Simon Property Group, L.P. and Subsidiaries

Form 10-Q

INDEX

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

The accompanying notes are an integral part of these statements.

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

The accompanying notes are an integral part of these statements.

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Simon Property Group, L.P. and Subsidiaries
Unaudited 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
Condensed Notes to Consolidated Financial Statements
(Unaudited)

(Dollars in thousands, except unit and per unit amounts and where indicated 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 condensed notes to the unaudited 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 specifically to Simon Property Group, Inc. (NYSE: SPG). Simon Property, a Delaware corporation, is a self-administered and self-managed real estate investment trust, or REIT, under the Internal Revenue Code, as amended. 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 September 30, 2011, we owned or held an interest in 335 income-producing properties in the United States, which consisted of 158 regional malls, 58 Premium Outlets, 67 community/lifestyle centers, 36 properties in the Mills portfolio, and 16 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 September 30, 2011, we had ownership interests in 45 shopping centers in Italy, eight Premium Outlets in Japan, two Premium Outlets in South Korea, and one Premium Outlet in Mexico.

2.     Basis of Presentation

        The accompanying unaudited consolidated financial statements include the accounts of all majority-owned subsidiaries, and all significant intercompany amounts have been eliminated. Due to the seasonal nature of certain operational activities, the results for the interim period ended September 30, 2011, are not necessarily indicative of the results to be expected for the full year.

        These consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and include all of the information and disclosures required by accounting principles generally accepted in the United States (GAAP) for interim reporting. Accordingly, they do not include all of the disclosures required by GAAP for complete financial statements. In the opinion of management, all adjustments necessary for fair presentation (including normal recurring accruals) have been included. The consolidated financial statements in this Form 10-Q should be read in conjunction with the audited consolidated financial statements and related notes contained in our 2010 Annual Report on Form 10-K.

        As of September 30, 2011, we consolidated 215 wholly-owned properties and 20 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 the joint venture properties, using the equity method of accounting. We manage the day-to-day operations of 91 of the 156 joint venture properties, but have determined that our partner or partners have substantive participating rights with respect to the assets and operations of these joint venture properties. Our investments in joint ventures in Italy, Japan, Korea, and Mexico comprise 56 of the remaining 65 joint venture properties. The international properties are managed locally 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 holds our interest in The Mills Limited Partnership, or Mills, using the equity method of accounting. We have determined that SPG-FCM is not a variable interest entity and that our joint venture partner has substantive participating rights with respect to the assets and operations of SPG-FCM pursuant to the applicable partnership agreements.

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        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 82.9% and 83.3% for the nine months ended September 30, 2011 and 2010, respectively. As of September 30, 2011 and December 31, 2010, Simon Property's ownership interest in us was 82.9% and 82.9%, respectively. We adjust the noncontrolling limited partners' interests at the end of each period to reflect their respective interests in us.

        Preferred unit requirements in the accompanying consolidated statements of operations and comprehensive income represent distributions on outstanding preferred units of partnership interests held by limited partners and are recorded when declared.

Reclassifications

        We made certain reclassifications of prior period amounts in the consolidated financial statements to conform to the 2011 presentation. These reclassifications had no impact on previously reported net income attributable to unitholders or earnings per unit.

3.     Significant Accounting Policies

Cash and Cash Equivalents

        We consider all highly liquid investments purchased with an original maturity of 90 days or less to be cash and cash equivalents. Cash equivalents are carried at cost, which approximates fair value. Cash equivalents generally consist of commercial paper, bankers acceptances, Eurodollars, repurchase agreements, and money market deposits or securities. Financial instruments that potentially subject us to concentrations of credit risk include our cash and cash equivalents and our trade accounts receivable. We place our cash and cash equivalents with institutions with high credit quality. However, at certain times, such cash and cash equivalents are in excess of FDIC and SIPC insurance limits.

Marketable and Non-Marketable Securities

        Marketable securities consist primarily of the investments of our captive insurance subsidiaries, available-for-sale securities, our deferred compensation plan investments, and certain investments held to fund the debt service requirements of debt previously secured by investment properties that have been sold.

        The types of securities included in the investment portfolio of our captive insurance subsidiaries typically include U.S. Treasury or other U.S. government securities as well as corporate debt securities with maturities ranging from less than 1 to 10 years. These securities are classified as available-for-sale and are valued based upon quoted market prices or other observable inputs when quoted market prices are not available. The amortized cost of debt securities, which approximates fair value, held by our captive insurance subsidiaries is adjusted for amortization of premiums and accretion of discounts to maturity. Changes in the values of these securities are recognized in accumulated other comprehensive income (loss) until the gain or loss is realized or until any unrealized loss is deemed to be other-than-temporary. We review any declines in value of these securities for other-than-temporary impairment and consider the severity and duration of any decline in value. To the extent an other-than-temporary impairment is deemed to have occurred, an impairment charge is recorded and a new cost basis is established. Subsequent changes are then recognized through other comprehensive income (loss) unless another other-than-temporary impairment is deemed to have occurred.

        Our investments in Capital Shopping Centres Group PLC, or CSCG, and Capital & Counties Properties PLC, or CAPC, are accounted for as available-for-sale securities. These investments are

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adjusted to their quoted market price, including a related foreign exchange component, with corresponding adjustment in other comprehensive income (loss). At September 30, 2011, we owned 35.4 million shares each of CSCG and of CAPC. At September 30, 2011, the market value of our investments in CSCG and CAPC was $180.9 million and $92.8 million, respectively, with an aggregate net unrealized gain on these investments of approximately $41.9 million. The market value of our investments in CSCG and CAPC at December 31, 2010 was $228.4 million and $82.4 million, respectively, with an aggregate unrealized gain of $79.0 million.

        Our insurance subsidiaries are required to maintain statutory minimum capital and surplus as well as maintain a minimum liquidity ratio. Therefore, our access to these securities may be limited. Our deferred compensation plan investments are classified as trading securities and are valued based upon quoted market prices. The investments have a matching liability as the amounts are fully payable to the employees that earned the compensation subject to the deferral provisions. Changes in value of these securities and changes in the matching liability to employees are both recognized in earnings and, as a result, there is no impact to consolidated net income. As of September 30, 2011 and December 31, 2010, we also had investments of $25.1 million which must be used to fund the debt service requirements of mortgage debt related to investment properties sold that previously collateralized the debt. These investments are classified as held-to-maturity and are recorded at amortized cost as we have the ability and intent to hold these investments to maturity.

        At September 30, 2011 and December 31, 2010, we had an investment of $72.4 million in a non-marketable security that we account for under the cost method. We regularly evaluate this investment for any other-than-temporary impairment in its estimated fair value and determined that no adjustment in the carrying value was required.

        Net unrealized gains recorded in other comprehensive income (loss) as of September 30, 2011 and December 31, 2010 were approximately $43.5 million and $79.3 million, respectively, and represent the valuation and related currency adjustments for our marketable securities. As of September 30, 2011, we do not consider any of the declines in value of our marketable and non-marketable securities to be an other-than-temporary impairment, as these market value declines, if any, have existed for a short period of time, and, in the case of debt securities, we have the ability and intent to hold these securities to maturity.

Loans Held for Investment

        From time to time, we may make investments in mortgage loans or mezzanine loans of third parties that own and operate commercial real estate assets located in the United States. Mortgage loans are secured, in part, by mortgages recorded against the underlying properties which are not owned by us. Mezzanine loans are secured, in part, by pledges of ownership interests of the entities that own the underlying real estate. Loans held for investment are carried at cost, net of any premiums or discounts which are accreted or amortized over the life of the related loan receivable utilizing the effective interest method. We evaluate the collectability of both interest and principal of each of these loans quarterly to determine whether the value has been impaired. A loan is deemed to be impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due according to the existing contractual terms. When a loan is impaired, the amount of the loss accrual is calculated by comparing the carrying amount of the loan held for investment to its estimated realizable value.

        At September 30, 2011 and December 31, 2010, we had investments in six mortgage and mezzanine loans with an aggregate carrying value of $397.6 million and $395.9 million, respectively. These loans mature at various dates through October 2012 with a weighted average maturity of approximately four months. Certain of these loans require interest-only payments while others require payments of interest and principal based on a 30 year amortization. Interest rates on these loans are fixed between 5.5% and 7.0% per annum with a weighted average interest rate of approximately 5.9% and approximate market rates for instruments of similar quality and duration. During the three and nine months ended

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September 30, 2011, we recorded $7.0 and $21.0 million, respectively, in interest income earned from these loans held for investment. Payments on each of these loans were current as of September 30, 2011. In October 2011, three of these mortgage loans with an aggregate principal balance of $235.0 million were repaid in their entirety.

        In addition, in 2011, we entered into secured loans with a developer and operator of commercial real estate as the lender to fund the construction of two real estate assets with an aggregate commitment of up to $235.8 million. The loans primarily bear interest at 7.0% and mature in May and July 2013. Each of these loans have two available one-year extensions. At September 30, 2011, the amounts drawn on the loans were $25.4 million.

Fair Value Measurements

        We hold marketable securities that totaled $487.3 million and $511.3 million at September 30, 2011 and December 31, 2010, respectively, and are considered to have Level 1 fair value inputs. In addition, we have derivative instruments which are classified as having Level 2 inputs which consist primarily of interest rate swap agreements and foreign currency forward contracts with a gross liability balance of $103.7 million and $27.6 million at September 30, 2011 and December 31, 2010, respectively, and a nominal asset value at September 30, 2011 and December 31, 2010. We also have interest rate cap agreements with nominal asset values.

        Level 1 fair value inputs are quoted prices for identical items in active, liquid and visible markets such as stock exchanges. Level 2 fair value inputs are observable information for similar items in active or inactive markets, and appropriately consider counterparty creditworthiness in the valuations. Level 3 fair value inputs reflect our best estimate of inputs and assumptions market participants would use in pricing an asset or liability at the measurement date. The inputs are unobservable in the market and significant to the valuation estimate.

        Note 6 includes a discussion of the fair value of debt measured using Level 1 and Level 2 inputs. Note 9 includes a discussion of the fair values recorded in purchase accounting using Level 2 and Level 3 inputs. Level 3 inputs to our purchase accounting include our estimations of net operating results of the property, capitalization rates and discount rates.

Noncontrolling Interests and Temporary Equity

        In addition to noncontrolling redeemable interests in properties, we classify our 7.5% Cumulative Redeemable Preferred Units, or 7.5% preferred units, in temporary equity due to the possibility that we could be required to redeem the securities for cash. The redemption of the 7.5% preferred units requires the delivery of fully registered shares of Simon Property common stock. The previous and current carrying amounts are equal to the liquidation value, which is the amount payable upon the occurrence of any event that could potentially result in cash settlement.

        Our evaluation of the appropriateness of classifying the units held by Simon Property and limited partners within permanent equity considered several significant factors in determining the appropriate classification of those units in the consolidated balance sheets. First, as a limited partnership, all decisions relating to our operations and distributions are made by Simon Property, acting as our sole general partner. The decisions of the general partner are made by Simon Property's Board of Directors, or the Board, or Simon Property's management. We have no other governance structure. Secondly, the sole asset of Simon Property is its interest in us. As a result, a share of Simon Property common stock (if owned by us) is best characterized as being similar to a treasury share and thus not an asset of the Operating Partnership.

        Limited partners have the right under our partnership agreement to exchange their units for shares of Simon Property common stock or cash as selected by the general partner. Accordingly, we classify limited

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partner units in permanent equity because Simon Property has the ability to issue shares of its common stock to limited partners exercising their exchange rights rather than using cash or other assets. Under our partnership agreement, we are required to redeem units held by Simon Property only when Simon Property has redeemed shares of its common stock. We classify units held by Simon Property in permanent equity because the decision to redeem those units would be made by Simon Property.

        Redeemable instruments, which typically represent the remaining interest in a property or portfolio of properties, and which are redeemable at the option of the holder or in circumstances that may be outside our control, are accounted for as temporary equity within preferred units, various series, at liquidation value, and noncontrolling redeemable interests in properties in the accompanying consolidated balance sheets. The carrying amount of the noncontrolling interest is adjusted to the redemption amount assuming the instrument is redeemable at the balance sheet date. Changes in the redemption value of the underlying noncontrolling interest are recorded within partners' equity. There are no noncontrolling interests redeemable at amounts in excess of fair value.

        Net income attributable to noncontrolling interests (which includes nonredeemable and redeemable noncontrolling interests in consolidated properties) is a component of consolidated net income. During the nine months ended September 30, 2011 and 2010 no individual components of other comprehensive income (loss) were attributable to noncontrolling interests. A rollforward of noncontrolling interests reflected in equity is as follows:

Derivative Financial Instruments

        We record all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether we have elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. We use a variety of derivative financial instruments in the normal course of business primarily to manage or hedge the risks associated with our indebtedness, anticipated future debt issuances, and interest payments. Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish this objective, we primarily use interest rate swaps, including forward starting interest rate swaps, and caps. We require that hedging derivative instruments be highly effective in reducing the risk exposure that they are designated to hedge. As a result, there was no significant ineffectiveness from any of our derivative activities during the period. We formally designate any instrument that meets these hedging criteria as a hedge at the inception of the derivative contract. We have no credit-risk-related hedging or derivative activities.

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        As of September 30, 2011, we had the following outstanding interest rate derivatives related to interest rate risk:

        The carrying value of our interest rate swap agreements, at fair value, is a net liability balance of $101.5 million and $19.5 million at September 30, 2011 and December 31, 2010, respectively, and is included in other liabilities and accrued distributions. The interest rate cap agreements were of nominal net value at September 30, 2011 and December 31, 2010 and we generally do not apply hedge accounting to these arrangements.

        We are also exposed to fluctuations in foreign exchange rates on financial instruments which are denominated in foreign currencies, primarily in Japan and Italy. We use currency forward contracts to manage our exposure to changes in foreign exchange rates on certain Yen and Euro-denominated receivables and net investments. Currency forward contracts involve fixing the Yen:USD or Euro:USD exchange rate for delivery of a specified amount of foreign currency on a specified date. The currency forward contracts are typically cash settled in US dollars for their fair value at or close to their settlement date. Approximately ¥4.0 billion remains as of September 30, 2011 for all forward contracts. We entered into Yen:USD forward contracts during 2009 for approximately ¥3 billion that we received through April 2011 and we entered into Yen:USD forward contracts during 2010 for ¥1.7 billion that we expect to receive through October 2012. In 2011, we entered into additional Yen:USD forward contracts for approximately ¥3.8 billion that we expect to receive through October 1, 2013. The September 30, 2011 net liability balance related to these forwards was $2.0 million, of which $2.2 million is included in other liabilities and accrued distributions and $0.2 million is included in deferred costs and other assets. We have reported the changes in fair value for these forward contracts in earnings. The underlying currency adjustments on the foreign-denominated receivables are also reported in income and generally offset the amounts in earnings for these forward contracts.

        The total gross accumulated other comprehensive loss related to our derivative activities, including our share of the other comprehensive loss from joint venture properties, approximated $140.6 million and $40.1 million as of September 30, 2011 and December 31, 2010, respectively.

Transaction Expenses

        We expense acquisition, potential acquisition and disposition related costs as they are incurred. During the nine months ended September 30, 2010, we incurred costs for the acquisition of Prime Outlets Acquisition Company, or the Prime acquisition, and other potential acquisitions, as further discussed in Note 9. In addition, during the three months ended September 30, 2010, we settled, in cash, a transaction-related dispute and recorded a charge to earnings. These expenses are included within transaction expenses in the accompanying statements of operations and comprehensive income and totaled $47.6 million and $62.6 million during the three and nine month periods ended September 30, 2010, respectively. We incurred a minimal amount of transaction expenses during the first nine months of 2011.

4.     Per Unit Data

        We determine basic earnings per unit based on the weighted average number of units outstanding during the period and we consider any participating securities for purposes of applying the two-class method. We determine diluted earnings per unit based on the weighted average number of units outstanding combined with the incremental weighted average units that would have been outstanding

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assuming all potentially dilutive common units were converted into units at the earliest date possible. The following table sets forth the computation of our basic and diluted earnings per unit.

        For the nine months ended September 30, 2011, potentially dilutive securities include options to purchase shares of Simon Property common stock and units granted under our long-term incentive performance, or LTIP, programs. The only securities that had a dilutive effect for the three and nine months ended September 30, 2011 and 2010 were stock options of Simon Property. We accrue distributions when they are declared.

5.     Investment in Unconsolidated Entities

Real Estate Joint Ventures

        Joint ventures are common in the real estate industry. We use joint ventures to finance properties, develop new properties, and diversify our risk in a particular property or portfolio of properties. We held joint venture ownership interests in 100 properties in the United States as of September 30, 2011 and 101 properties as of December 31, 2010. We also held an interest in a joint venture which owned 45 shopping centers in Italy as of September 30, 2011 and December 31, 2010. At September 30, 2011, we also held interests in eight joint venture properties in Japan, two joint venture properties in South Korea, and one joint venture property in Mexico. We account for these joint venture properties using the equity method of accounting.

        Substantially all of our joint venture properties are subject to rights of first refusal, buy-sell provisions, or other sale or marketing rights for partners which are customary in real estate joint venture agreements and the industry. We and our partners in these joint ventures may initiate these provisions at any time (subject to any applicable lock up or similar restrictions), which could result in either the sale of our interest or the use of available cash or borrowings to acquire a joint venture interest from our partner.

        In May 2010, Opry Mills, a property in which we have a 50% interest through our SPG-FCM joint venture, sustained significant flood damage and substantially all of the property remains closed. Insurance proceeds of $50 million have been funded by the insurers and remediation work has been completed. The excess insurance carriers (those providing coverage above $50 million) have denied the joint venture's claim under the policy for additional proceeds (of up to $150 million) to pay further amounts for restoration costs and business interruption losses. We have obtained additional financing of $120 million from the existing mortgage lenders, and in April 2011 commenced rebuilding the center with an expected opening in March of 2012. We and our lenders are continuing our efforts through pending litigation to recover our losses under the excess insurance policies for Opry Mills and we believe recovery is probable, but no assurances can be made that our efforts to recover these funds will be successful.

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Loans to SPG-FCM

        We have a loan to SPG-FCM with an outstanding balance of $651.0 million as of September 30, 2011 and December 31, 2010. During the nine month periods ended September 30, 2011 and 2010, we recorded approximately $7.4 million in interest income (net of inter-entity eliminations), related to this loan. The loan bears interest at a rate of LIBOR plus 275 basis points and matures on June 7, 2012.

International Joint Venture Investments

        We conduct our international operations through joint venture arrangements and account for all of our international joint venture investments using the equity method of accounting.

        Italian Joint Venture.    We have a 49% ownership interest in Gallerie Commerciali Italia, or GCI, a joint venture with Auchan S.A. The carrying amount of our investment in GCI was $346.9 million and $330.1 million as of September 30, 2011 and December 31, 2010, respectively; including all related components of accumulated other comprehensive income (loss).

        Asian Joint Ventures.    We conduct our international Premium Outlet operations in Japan through a joint venture with Mitsubishi Estate Co., Ltd. We have a 40% ownership interest in this joint venture. The carrying amount of our investment in this joint venture was $349.4 million and $340.8 million as of September 30, 2011 and December 31, 2010, respectively, including all related components of accumulated other comprehensive income (loss). We conduct our international Premium Outlet operations in Korea through a joint venture with Shinsegae International Co. We have a 50% ownership interest in this joint venture. The carrying amount of our investment in this joint venture was $41.2 million and $35.7 million as of September 30, 2011 and December 31, 2010, respectively, including all related components of accumulated other comprehensive income (loss).

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Summary Financial Information

        A summary of our investments in joint ventures and share of income from such joint ventures follows. The statement of operations for the year ended December 31, 2010 includes amounts related to our investments in Simon Ivanhoe S.à.r.l. which was sold on July 15, 2010. In addition, we acquired additional controlling interests in The Plaza at King of Prussia and The Court at King of Prussia, or King of Prussia, on August 25, 2011. This previously unconsolidated property is now a consolidated property as of the acquisition date. Balance sheet information for the joint ventures is as follows:

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        "Excess Investment" represents the unamortized difference of our investment over our share of the equity in the underlying net assets of the joint ventures acquired. We amortize excess investment over the life of the related properties, typically no greater than 40 years, and the amortization is included in the reported amount of income from unconsolidated entities.

6.     Debt

Unsecured Debt

        At September 30, 2011, our unsecured debt consisted of $9.6 billion of senior unsecured notes and $1.8 billion outstanding under an unsecured revolving credit facility, or Credit Facility. At September 30, 2011, the Credit Facility had a borrowing capacity of $3.9 billion. The Credit Facility had a maturity date of March 31, 2013 and the base interest on the Credit Facility was LIBOR plus 210 basis points and included an annual facility fee of 40 basis points on the total borrowing capacity. The Credit Facility also included a money market competitive bid feature, which allowed participating lenders to bid on amounts outstanding at then current market rates of interest.

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        On October 5, 2011, we entered into a new unsecured credit facility, or New Facility, providing an initial borrowing capacity of $4.0 billion which can be increased to $5.0 billion during its term. The New Facility will initially mature on October 30, 2015 and can be extended for an additional year at our sole option. The base interest rate on the New Facility is LIBOR plus 100 basis points and an additional facility fee of 15 basis points. In addition, the New Facility provides for a money market competitive bid option program that allows us to hold auctions to achieve lower pricing for short-term borrowings. The New Facility also includes a $2.0 billion multi-currency tranche.

        The total outstanding balance of the Credit Facility as of September 30, 2011 was $1.8 billion, and the maximum outstanding balance during the nine months ended September 30, 2011 was $1.8 billion. The September 30, 2011 balance included $290.6 million (U.S. dollar equivalent) of Yen-denominated borrowings. During the nine months ended September 30, 2011, the weighted average outstanding balance on the Credit Facility was approximately $983.4 million. Letters of credit of approximately $36.0 million were outstanding under the Credit Facility as of September 30, 2011.

        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 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 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.

        During the nine months ended September 30, 2011, we redeemed at par $382.8 million of senior unsecured notes with fixed rates ranging from 5.38% to 8.25%.

Secured Debt

        Total secured indebtedness was $6.5 billion at September 30, 2011 and $6.6 billion at December 31, 2010. During the nine months ended September 30, 2011, we repaid $281.2 million in mortgage loans with a weighted average interest rate of 6.87%, unencumbering five properties.

        As a result of the acquisition of additional interest in King of Prussia in August 2011 (see Note 9), we now own a controlling interest in this property and, accordingly, we consolidated the property as of the acquisition date, including the property's $160.1 million mortgage debt.

Covenants

        Our unsecured debt contains financial covenants and other non-financial covenants. If we were to fail to comply with these covenants, after the expiration of the applicable cure periods, the debt maturity could be accelerated or other remedies could be sought by the lender including adjustments to the applicable interest rate. As of September 30, 2011, we are in compliance with all covenants of our unsecured debt.

        At September 30, 2011, we or our subsidiaries are the borrowers under 87 non-recourse mortgage notes secured by mortgages on 87 properties, including 10 separate pools of cross-defaulted and cross-

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collateralized mortgages encumbering a total of 44 properties. Under these cross-default provisions, a default under any mortgage included in the cross-defaulted pool may constitute a default under all mortgages within that pool and may lead to acceleration of the indebtedness due on each property within the pool. Certain of our secured debt contains financial and other non-financial covenants which are specific to the properties which serve as collateral for that debt. If the borrower fails to comply with these covenants, the lender could accelerate the debt and enforce its right against their collateral. At September 30, 2011, the applicable borrowers under these non-recourse mortgage notes were in compliance with all covenants where non-compliance could individually, or giving effect to applicable cross-default provisions, have a material adverse effect on our financial condition, results of operations or cash flows.

Fair Value of Debt

        The carrying value of our variable-rate mortgages and other loans approximates their fair values. We estimate the fair values of consolidated fixed-rate mortgages using cash flows discounted at current borrowing rates and other indebtedness using cash flows discounted at current market rates. We estimate the fair values of consolidated fixed-rate unsecured notes using quoted market prices, or, if no quoted market prices are available, we use quoted market prices for securities with similar terms and maturities. The book value of our consolidated fixed-rate mortgages and other indebtedness was $14.5 billion and $14.8 billion as of September 30, 2011 and December 31, 2010, respectively. The fair values of these financial instruments and the related discount rate assumptions as of September 30, 2011 and December 31, 2010 are summarized as follows:

7.     Equity

        During the first nine months of 2011, 24 limited partners exchanged 564,918 of our units for an equal number of shares of Simon Property common stock. These transactions increased Simon Property's ownership interest in us.

Stock Based Compensation

        Under the Simon Property Group, L.P. 1998 Stock Incentive Plan, or the Plan, on February 24, 2011 the Compensation Committee of the Board awarded 78,046 restricted shares of Simon Property common stock to employees at a fair market value of $105.64 per share. The Compensation Committee awarded an additional 35,000 restricted shares of Simon Property common stock on May 4, 2011 at a fair market value of $115.59 per share. On May 19, 2011, Simon Property's non-employee Directors were awarded 6,100 restricted shares of Simon Property common stock under this plan at a fair market value of $116.24 per share as a result of their re-election to Simon Property's Board. The fair market value of the restricted stock awarded on February 24, 2011 is being recognized as expense over the three-year vesting service period. The fair market value of the restricted stock awarded on May 4, 2011 is being recognized as expense over the four-year vesting service period. The fair market value of the restricted stock awarded on May 19, 2011 to Simon Property's non-employee Directors is being recognized as expense over the one-year vesting service period. In accordance with our partnership agreement, we issued an equal number of units to Simon Property.

        On March 16, 2010, the Compensation Committee of the Board approved three long-term incentive performance programs, or the 2010 LTIP programs, for certain senior executive officers. Awards under the

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2010 LTIP programs take the form of LTIP units, a form of limited partnership interest issued by us. During the performance period, participants are entitled to receive on the LTIP units awarded to them distributions equal to 10% of the regular quarterly distributions paid on a unit. As a result, we account for these LTIP units as participating securities under the two-class method of computing earnings per unit. Awarded LTIP units will be considered earned, in whole or in part, depending upon the extent to which the applicable total shareholder return, or TSR, benchmarks, as defined, are achieved during the performance period and, once earned, will become the equivalent of units after a two year service-based vesting period, beginning after the end of the performance period. Awarded LTIP units not earned are forfeited.

        The 2010 LTIP programs have one, two and three year performance periods, which end on December 31, 2010, 2011 and 2012, respectively. During July 2011, the Compensation Committee approved a three-year long-term incentive performance program, or the 2011-2013 LTIP program, and awarded LTIP units to certain senior executive officers. The 2011-2013 LTIP program has a three year performance period ending on December 31, 2013. After the end of each performance period, any earned LTIP units will then be subject to service-based vesting over a period of two years. One-half of the earned LTIP units will vest on January 1 of each of the second and third years following the end of the applicable performance period, subject to the participant maintaining employment with us through those dates.

        The 2010 LTIP program awards have an aggregate grant date fair value, adjusted for estimated forfeitures, of $7.2 million for the one-year program, $14.8 million for the two-year program and $23.0 million for the three-year program. The 2011-2013 LTIP program awards have an aggregate grant date fair value of $35.0 million, adjusted for estimated forfeitures. Grant date fair values were estimated based upon the results of a Monte Carlo model, and the resulting expense will be recorded regardless of whether the TSR benchmarks are achieved. The grant date fair values are being amortized into expense over the period from the grant date to the date at which the awards, if any, become vested. In 2011, the Compensation Committee determined that 133,673 LTIP units were earned under the one-year 2010 LTIP program and, pursuant to the award agreements, will vest in two equal installments in 2012 and 2013.

        On July 6, 2011, in connection with the execution of an employment agreement, the Compensation Committee granted David Simon, Simon Property's Chairman and CEO, a retention award in the form of 1,000,000 LTIP units. The award vests in one-third increments on July 5^th of 2017, 2018 and 2019, subject to continued employment. The grant date fair value of the retention award was $120.3 million which is being recognized as expense over the eight-year vesting period on a straight-line basis.

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Changes in Equity

        The following table provides a reconciliation of the beginning and ending carrying amounts of total equity, equity attributable to partners and equity attributable to noncontrolling interests:

8.     Commitments and Contingencies

Litigation

        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.

Guarantees of Indebtedness

        Joint venture debt is the liability of the joint venture and is typically secured by the joint venture property, which is non-recourse to us. As of September 30, 2011 and December 31, 2010, we had guaranteed joint venture related mortgage or other indebtedness of $31.2 million and $60.7 million, respectively. Mortgages guaranteed by us are secured by the property of the joint venture and that property could be sold in order to satisfy the outstanding obligation.

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9.     Real Estate Acquisitions and Dispositions

        During the nine months ended September 30, 2011, we disposed of our interests in three retail properties for a net gain of $2.5 million. Additionally, on June 28, 2011, we sold Prime Outlets — Jeffersonville for $134.0 million, resulting in a net gain of $6.6 million. These gains are included in gain upon acquisition of controlling interest, and on sale or disposal of assets and interests in unconsolidated entities, net in the accompanying statements of operations and comprehensive income.

        On August 25, 2011, we acquired additional controlling interests of approximately 83.75% in King of Prussia thereby increasing our ownership interest to 96.1%. The property is subject to a $160.1 million mortgage. The consolidation of this previously unconsolidated property resulted in a remeasurement of our previously held interest to fair value and a corresponding non-cash gain of $82.9 million which is included in gain 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 July 19, 2011, we acquired a 100% ownership interest in ABQ Uptown, a lifestyle center located in Albuquerque, New Mexico. Also, during the second quarter, we purchased an additional interest in an unconsolidated regional mall.

        The aggregate cash purchase price for these acquisitions was $1.18 billion. We reflected the assets and liabilities of these assets at estimated fair value at the respective acquisition dates, the majority of which was allocated to the investment property. The purchase price allocation is preliminary and subject to revision within the measurement period, not to exceed one year from the date of acquisition.

        During the third quarter of 2011 we contributed a wholly-owned property to a joint venture which holds our interests in nine unconsolidated properties. The transaction effectively exchanged a portion of our interest in the previously wholly-owned property for increased ownership interests in the nine unconsolidated properties. This transaction had no material impact on the statement of operations.

        On August 30, 2010, we completed the Prime acquisition, adding 21 outlet centers, 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 approximately 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 the Credit Facility.

        We recorded our acquisition of these 21 outlet centers using the acquisition method of accounting. Tangible and intangible assets and liabilities were established based on their estimated fair values at the date of acquisition. The results of operations of the acquired properties have been included in our consolidated results from the date of acquisition. The purchase price allocations were finalized during the second quarter. No significant adjustments were made to the previously reported purchase price allocations.

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Item 2.    Management's Discussion and Analysis of Financial Condition and Results of Operations

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

Overview

        Simon Property Group, L.P. is a Delaware limited partnership and the majority-owned partnership 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. Simon Property, a Delaware corporation, is a self-administered and self-managed real estate investment trust, or REIT, under the Internal Revenue Code, as amended. 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 September 30, 2011, we owned or held an interest in 335 income-producing properties in the United States, which consisted of 158 regional malls, 58 Premium Outlets, 67 community/lifestyle centers, 36 properties in the Mills portfolio, and 16 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 September 30, 2011, we had ownership interests in 45 shopping centers in Italy, eight Premium Outlets in Japan, two Premium Outlets in South Korea, and one Premium Outlet in Mexico.

        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 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 highly productive locations at competitive rental rates,



•

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



•

Selling selective non-core assets.

        We also grow by generating supplemental revenues 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 provision of energy services,



•

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 investments in loans, including those made to related entities.

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        We focus on high quality real estate across the retail real estate spectrum. We expand or renovate properties 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 metropolitan areas that exhibit strong population and economic growth.

        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 $0.89 during the first nine months of 2011 to $2.24 from $1.35 for the same period last year. The increase in diluted earnings per unit was primarily attributable to:

•

improved operating performance and core business fundamentals in 2011, the impact of our acquisition activity, and a decrease in interest expense due to the repayment of debt and lower interest rates,



•

in 2011, a gain due to the acquisition of a controlling interest, sale or disposal of assets and interests in unconsolidated entities, net of $78.3 million, or $0.22 per diluted unit, primarily driven by an $82.9 million gain related to the acquisition of a controlling interest in a previously unconsolidated regional mall,



•

in 2010, a $350.7 million, or $1.00 per diluted unit, loss on extinguishment of debt related to our two senior unsecured notes tender offers during the first nine months of 2010, and



•

in 2010, a gain due to acquisition of controlling interest, sale or disposal of assets and interests in unconsolidated entities, net of $320.3 million, or $0.92 per diluted unit, primarily driven by the sale of our interest in Simon Ivanhoe S.à.r.l., or Simon Ivanhoe, in the third quarter of 2010.

        Core business fundamentals during the first nine months of 2011 improved from the economic environment that existed during the first nine months of 2010. Total sales per square foot, or psf, increased 9.3% from September 30, 2010 to $517 psf at September 30, 2011 for our portfolio of regional malls and Premium Outlets. Average base minimum rent psf increased 3.4% to $38.87 psf as of September 30, 2011, from $37.58 psf as of September 30, 2010. Releasing spreads remained positive as we were able to lease available square feet at higher rents than the expiring rental rates on a same space basis resulting in a releasing spread (based on total tenant payments — base minimum rent plus common area maintenance) of $4.77 psf as of September 30, 2011, representing a 9.6% increase over expiring payments as of September 30, 2010. Ending occupancy was 93.9% as of September 30, 2011, as compared to 93.8% as of September 30, 2010, an increase of 10 basis points.

        Our effective overall borrowing rate at September 30, 2011 decreased 23 basis points to 5.37% as compared to 5.60% at September 30, 2010. This decrease was primarily due to a $0.5 billion decrease in our fixed rate debt ($15.0 billion at September 30, 2011 as compared to $15.5 billion at September 30, 2010, including debt which is effectively fixed via an interest rate swap) and a decrease in the effective overall borrowing rate on fixed rate debt of six basis points (6.01% at September 30, 2011 as compared to 6.07% at September 30, 2010). At September 30, 2011, the weighted average years to maturity of our consolidated indebtedness was approximately 5.4 years as compared to approximately 5.9 years at

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December 31, 2010. Our financing activities for the nine months ended September 30, 2011, included the redemption at par of $382.8 million of senior unsecured notes with fixed rates ranging from 5.38% to 8.25% and repayment of $281.2 million in mortgage loans with a weighted average interest rate of 6.87% unencumbering five properties. As further discussed in "Financing and Debt" below, on October 5, 2011, we entered into a new unsecured corporate credit facility, or New Facility.

United States Portfolio Data

        The portfolio data discussed in this overview includes the following key operating statistics: ending occupancy, average base minimum rent per square foot, and total 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 related to community/lifestyle centers and our investment in the Mills portfolio from our other U.S. operations. We also do not include any properties located outside of the United States. During 2011, we made changes to the method and presentation of certain of our operational statistics as defined below.

        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.

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        Ending Occupancy Levels and Average Base Minimum Rent per Square Foot.    Ending occupancy is the percentage of gross leasable area, or GLA, which is leased as of the last day of the reporting period. We include all company owned space except for regional mall anchors and regional mall majors in the calculation. Base minimum rent per square foot is the average base minimum rent charge in effect for the reporting period for all tenants that would qualify to be included in ending occupancy.

        Total Sales per Square Foot.    Total 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.

International Property Data

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

Results of Operations

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

•

During the first nine months of 2011, we disposed of one of our other retail properties and one of our regional malls.



•

On August 25, 2011, we acquired additional interests in The Plaza at King of Prussia and The Court at King of Prussia, or King of Prussia, which had previously been accounted for under the equity method. We now have a controlling interest in this property and its results are consolidated as of the acquisition date.



•

On July 19, 2011, we acquired a 100% ownership interest in ABQ Uptown.



•

On June 28, 2011, we sold Prime Outlets — Jeffersonville.

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•

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



•

On August 30, 2010, we completed the acquisition of Prime Outlets Acquisition Company, or the Prime acquisition, acquiring 21 outlet centers, including a center located in Puerto Rico, which was acquired on May 13, 2010.



•

On August 10, 2010, we acquired a controlling interest in a regional mall.

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

•

During the first nine months of 2011, we disposed of one of our regional malls.



•

During the third quarter of 2011, we contributed a wholly-owned property to a joint venture which holds our interests in nine unconsolidated properties. The transaction effectively exchanged a portion of our interest in this previously wholly-owned property for increased ownership interests in the nine unconsolidated properties.



•

On March 17, 2011, we and our partner, Shinsegae International Co., opened Paju Premium Outlets, a 328,000 square foot outlet center in Paju, South Korea.



•

During 2010, we disposed of one of our other retail properties.



•

On July 15, 2010, we and our partner sold our collective interests in a joint venture which owned seven shopping centers located in France and Poland.



•

On May 28, 2010, we acquired an additional ownership 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, an Italian joint venture 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.

        For the purposes of the following comparison between the three and nine months ended September 30, 2011 and 2010, 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 the periods in both 2011 and 2010.

Three Months Ended September 30, 2011 vs. Three Months Ended September 30, 2010

        Minimum rents increased $59.6 million during the 2011 period, of which the property transactions accounted for $40.2 million of the increase. Comparable rents increased $19.4 million, or 3.4%. The increase in comparable rents was primarily attributable to a $19.5 million increase in base minimum rents and a $1.2 million increase in comparable rents from carts, kiosks, and other temporary tenants, offset by a $0.2 million decrease in straight-line rents and a $1.1 million decline in the amortization of the fair market value of in-place leases. Overage rents increased $10.4 million, or 39.6%, as a result of an increase related to the property transactions of $3.7 million and an increase in tenant sales during 2011.

        Tenant reimbursements increased $20.3 million due to a $13.5 million increase attributable to the property transactions and a $6.8 million, or 2.6%, increase in the comparable properties primarily due to increases to the fixed reimbursement related to common area maintenance.

        Depreciation and amortization expense increased $17.5 million primarily due to the additional depreciable assets acquired in the Prime acquisition in August 2010.

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        Repairs and maintenance expense increased $4.3 million of which the property transactions accounted for $1.4 million and the comparable properties increased $2.9 million primarily due to increased general repairs at the properties.

        In the third quarter of 2011, we recorded a provision for credit losses of $1.5 million whereas in the third quarter of 2010, as a result of strong collections and recoveries of receivables for which we had previously established reserves due to the uncertainty of ultimate payment, we had a net recovery of $3.1 million.

        General and administrative expense increased $9.8 million primarily as a result of increased incentive compensation costs.

        During the three months ended September 30, 2010, we incurred $47.6 million in transaction expenses related to costs associated with acquisition related activities, and the settlement of a transaction related dispute.

        Other expenses increased $7.1 million of which the property transactions accounted for $2.4 million and the comparable properties accounted for $4.7 million primarily related to an increase in legal and professional fees and unfavorable foreign currency revaluation.

        Interest expense decreased $4.9 million primarily related to the net impact from repayment of mortgages at three properties and the purchases of senior unsecured notes in the January 2010 and August 2010 tender offers, offset by increased borrowings under the unsecured revolving credit facility, or Credit Facility, in 2011, the result of new or refinanced debt at several properties including debt associated with the Prime acquisition and new unsecured debt.

        The third quarter of 2010 included a loss on extinguishment of debt of $185.1 million related to the August 2010 unsecured note tender offer.

        Income from unconsolidated entities decreased $5.4 million primarily as a result of the sale of a non-retail building in 2010.

        During the three months ended September 30, 2011, we disposed of our interest in a regional mall and acquired a controlling interest in a regional mall previously accounted for under the equity method for an aggregate net gain of $78.3 million. During the third quarter of 2010, we recognized a $294.3 million gain primarily due to our share of the gain on the sale of our interest in Simon Ivanhoe and the gain on the acquisition of a controlling interest in a regional mall previously accounted for under the equity method.

Nine Months Ended September 30, 2011 vs. Nine Months Ended September 30, 2010

        Minimum rents increased $201.7 million during the 2011 period, of which the property transactions accounted for $152.2 million of the increase. Comparable rents increased $49.5 million, or 2.9%. The increase in comparable rents was primarily attributable to a $49.3 million increase in base minimum rents and a $5.8 million increase in comparable rents from carts, kiosks, and other temporary tenants, offset by a $2.7 million decrease in straight-line rents and a $2.9 million decline in the amortization of the fair market value of in-place leases. Overage rents increased $21.8 million, or 40.4%, as a result of an increase related to the property transactions of $11.4 million and an increase in tenant sales during 2011.

        Tenant reimbursements increased $75.7 million, due to a $52.2 million increase attributable to the property transactions and a $23.5 million, or 3.1%, increase in the comparable properties primarily due to increases to the fixed reimbursement related to common area maintenance.

        Total other income decreased $8.2 million, principally as a result of the result of the following:

•

a decrease in lease settlement income of $29.9 million due to a higher number of terminated leases in 2010,

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•

offset by an increase in interest income of $11.5 million primarily related to loans held for investment,



•

a $1.8 million increase in land sale activity, and



•

a $8.4 million increase in net other activity.

        Depreciation and amortization expense increased $82.0 million primarily due to the additional depreciable assets acquired in the Prime acquisition in August 2010.

        Real estate tax expense increased $18.9 million of which the property transactions accounted for $14.6 million with the remaining increase primarily caused by higher tax payments in 2011.

        Repairs and maintenance expense increased $15.4 million of which the property transactions accounted for $5.8 million and the comparable properties increased $9.6 million primarily due to increased general repairs at the properties and snow removal costs.

        In the first nine months of 2011, we recorded a provision for credit losses of $3.2 million whereas in the prior year period, as a result of strong collections and recoveries of receivables for which we had previously established reserves due to the uncertainty of ultimate payment, we had a net recovery of $2.1 million.

        Home and regional office expense increased $18.3 million primarily due to a favorable settlement from a legacy incentive compensation plan as we transitioned to our current programs in the first quarter of 2010 as well as marginally higher personnel costs and increased long-term incentive compensation costs in 2011.

        General and administrative expense increased $15.7 million primarily as a result of increased performance compensation costs.

        During the nine months ended September 30, 2010, we incurred $62.6 million in transaction expenses related to costs associated with acquisition related activities, and the settlement of a transaction related dispute.

        Other expenses increased $16.8 million of which the property transactions accounted for $8.6 million and the comparable properties accounted for $8.2 million primarily related to an increase in legal and professional fees and unfavorable foreign currency revaluation.

        Interest expense decreased $37.7 million primarily related to the repayment of four unsecured notes in 2011, repayment of mortgages at five properties and the purchases of senior unsecured notes in the January 2010 and August 2010 tender offers, offset by the result of increased borrowings under the Credit Facility in 2011, new or refinanced debt at several properties including debt associated with the Prime acquisition and new unsecured debt.

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

        During the nine months ended September 30, 2011, we disposed of our interest in an unconsolidated regional mall, one regional mall, an other retail property, and Prime Outlets — Jeffersonville, and acquired a controlling interest in a regional mall previously accounted for under the equity method for an aggregate net gain of $92.1 million. During the nine months ended September 30, 2010, we recorded a gain of $320.3 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 the sale of Porta di Roma by GCI.

        Preferred unit distributions decreased $3.7 million as a result of the conversion and redemption of the remaining 6% Series I Convertible Perpetual Preferred Units in the second quarter of 2010.

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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 and entering into floating rate to fixed rate interest rate swaps. Floating rate debt currently comprises approximately 16.3% of our total consolidated debt at September 30, 2011. 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 $1.7 billion during the nine months ended September 30, 2011. In addition, the New Facility provides an alternative source of liquidity as our cash needs vary from time to time.

        Our balance of cash and cash equivalents decreased $220.9 million during the first nine months of 2011 to $575.8 million as of September 30, 2011 as further discussed in "Cash Flows" below.

        On September 30, 2011, we had available borrowing capacity of approximately $2.1 billion under the Credit Facility, net of outstanding borrowings of $1.8 billion and letters of credit of $36.0 million. For the nine months ended September 30, 2011, the maximum amount outstanding under the Credit Facility was $1.8 billion and the weighted average amount outstanding was approximately $983.4 million. The weighted average interest rate was 1.84% for the nine months ended September 30, 2011. On October 5, 2011, we entered into a New Facility, providing an initial borrowing capacity of $4.0 billion. The New Facility, which can be increased to $5.0 billion during its term, will initially mature on October 30, 2015 and can be extended for an additional year at our sole option.

        We also have historically had access to long term unsecured debt markets and access to private equity from institutional investors at the property level. Simon Property also has historically had access to public equity markets.

        Our business model requires us to regularly access the debt and equity capital markets to raise funds for acquisition, development and redevelopment activity, and to refinance maturing debt. We believe we have sufficient cash on hand and availability under the New Facility to address our debt maturities and capital needs through 2012.

        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 of our senior unsecured notes portfolio.

Loans to SPG-FCM

        As part of the Mills acquisition in 2007, we made loans to SPG-FCM Ventures, LLC, or SPG-FCM, and Mills which were used by SPG-FCM and Mills to repay loans and other obligations of Mills. As of September 30, 2011 and December 31, 2010, the outstanding balance of our remaining loan to SPG-FCM was $651.0 million. During the quarters ended September 30, 2011 and 2010, we recorded approximately $7.4 million in interest income (net of inter-entity eliminations), related to this loan. The loan bears interest at a rate of LIBOR plus 275 basis points and matures on June 7, 2012.

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Cash Flows

        Our net cash flow from operating activities and distributions of capital from unconsolidated entities for the nine months ended September 30, 2011 totaled $1.7 billion. In addition, we received net proceeds from our debt financing and repayment activities of $278.4 million in 2011. These activities are further discussed below in "Financing and Debt." During the 2011 period, we also:

•

paid unitholder distributions totaling $848.6 million,



•

paid preferred unit distributions totaling $4.0 million,



•

funded consolidated capital expenditures of $299.4 million (includes development and other costs of $54.7 million, renovation and expansion costs of $102.0 million, and tenant costs and other operational capital expenditures of $142.7 million),



•

funded investments in unconsolidated entities of $15.4 million, and



•

funded a property acquisition and acquired an additional controlling interest in a previously unconsolidated entity for $1.18 billion.

        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 the New Facility,



•

additional secured or unsecured debt financing, or



•

additional equity raised in the public or private markets.

        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 rents paid by our retail tenants, many of whom are still recovering from the recent economic downturn. A significant deterioration in projected cash flows from operations could cause us to increase our reliance on available funds from the New Facility, curtail planned capital expenditures, or seek other additional sources of financing as discussed above.

Financing and Debt

Unsecured Debt

        At September 30, 2011, our unsecured debt consisted of $9.6 billion of senior unsecured notes and $1.8 billion outstanding under the Credit Facility. At September 30, 2011, the Credit Facility had a borrowing capacity of $3.9 billion. The Credit Facility had a maturity date of March 31, 2013 and base interest on the Credit Facility was LIBOR plus 210 basis points and included an annual facility fee of 40 basis points on the total borrowing capacity. The Credit Facility also included a money market competitive bid feature, which allowed participating lenders to bid on amounts outstanding at then current market rates of interest.

        On October 5, 2011, we entered into the New Facility, providing an initial borrowing capacity of $4.0 billion, which can be increased to $5.0 billion during its term. The New Facility will initially mature on October 30, 2015 and can be extended for an additional year at our sole option. The base interest rate on the New Facility is LIBOR plus 100 basis points and an additional facility fee of 15 basis points. In addition, the New Facility provides for a money market competitive bid option program that allows us to

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hold auctions to achieve lower pricing for short-term borrowings. The New Facility also includes a $2.0 billion multi-currency tranche.

        The total outstanding balance of the Credit Facility as of September 30, 2011 was $1.8 billion, and the maximum outstanding balance during the nine months ended September 30, 2011 was $1.8 billion. The September 30, 2011 balance included $290.6 million (U.S. dollar equivalent) of Yen-denominated borrowings. During the nine months ended September 30, 2011, the weighted average outstanding balance on the Credit Facility was approximately $983.4 million. Letters of credit of approximately $36.0 million were outstanding under the Credit Facility as of September 30, 2011.

        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 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 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.

        During the nine months ended September 30, 2011, we redeemed at par $382.8 million of senior unsecured notes with fixed rates ranging from 5.38% to 8.25%.

Secured Debt

        Total secured indebtedness was $6.5 billion at September 30, 2011 and $6.6 billion at December 31, 2010. During the nine months ended September 30, 2011, we repaid $281.2 million in mortgage loans with a weighted average interest rate of 6.87% unencumbering five properties.

        In September 2011, we acquired additional controlling interests in King of Prussia. We now consolidate this property and its $160.1 million mortgage as of the acquisition date.

Covenants

        Our unsecured debt contains financial covenants and other non-financial covenants. If we were to fail to comply with these covenants, after the expiration of the applicable cure periods, the debt maturity could be accelerated or other remedies could be sought by the lender including adjustments to the applicable interest rate. As of September 30, 2011, we are in compliance with all covenants of our unsecured debt.

        At September 30, 2011, we or our subsidiaries are the borrowers under 87 non-recourse mortgage notes secured by mortgages on 87 properties, including 10 separate pools of cross-defaulted and cross-collateralized mortgages encumbering a total of 44 properties. Under these cross-default provisions, a default under any mortgage included in the cross-defaulted pool may constitute a default under all mortgages within that pool and may lead to acceleration of the indebtedness due on each property within the pool. Certain of our secured debt contains financial and other non-financial covenants which are specific to the properties which serve as collateral for that debt. If the borrower fails to comply with these covenants, the lender could accelerate the debt and enforce its right against their collateral. At

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September 30, 2011, the applicable borrowers under these non-recourse mortgage notes were in compliance with all covenants where non-compliance could individually, or giving effect to applicable cross-default provisions, have a material adverse effect on our financial condition, results of operations or cash flows.

Summary of Financing

        Our consolidated debt, adjusted to reflect outstanding derivative instruments, and the effective weighted average interest rates as of September 30, 2011, and December 31, 2010, consisted of the following (dollars in thousands):

        As of September 30, 2011, we had $486.1 million of notional amount fixed rate swap agreements that have a weighted average fixed pay rate of 2.52% and a weighted average variable receive rate of 0.58%. As of September 30, 2011, the net effect of these agreements effectively converted $486.1 million of variable rate debt to fixed rate debt.

Contractual Obligations and Off-Balance Sheet Arrangements

        There have been no material changes to our outstanding capital expenditure and lease commitments previously disclosed in our 2010 Annual Report on Form 10-K.

        In regards to long-term debt arrangements, the following table summarizes the material aspects of these future obligations on our consolidated indebtedness as of September 30, 2011, for the remainder of 2011 and subsequent years thereafter (dollars in thousands) assuming the obligations remain outstanding through initial maturities:

        In 2011, we entered into secured loans with a developer and operator of commercial real estate as the lender to fund the construction of two retail assets with an aggregate commitment of up to $235.8 million. The loans primarily bear interest at 7.0% and mature in May and July 2013. Each of these loans has two available one-year extensions. At September 30, 2011, the amounts drawn on the loans were $25.4 million.

        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 5 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 September 30, 2011,

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we had guaranteed $31.2 million of joint venture related mortgage or other indebtedness. 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.

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. We and 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 partners' 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.    On August 25, 2011, we acquired additional controlling interests of approximately 83.75% in King of Prussia, thereby increasing our ownership interest to 96.1%. The property is subject to a $160.1 million mortgage. The consolidation of this previously unconsolidated property resulted in a remeasurement of our previously held interest to fair value and a corresponding non-cash gain of $82.9 million which is included in gain 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 July 19, 2011 we acquired a 100% ownership interest in ABQ Uptown, a lifestyle center located in Albuquerque, New Mexico. Also, during the second quarter, we purchased an additional interest in an unconsolidated regional mall.

        Dispositions.    We continue to pursue the disposition of properties that no longer meet our strategic criteria or that are not a primary retail venue within their trade area. During the nine months ended September 30, 2011, we disposed of one of our other retail properties, our interest in an unconsolidated regional mall, and one consolidated regional mall for a net gain of $2.5 million. Additionally, on June 28, 2011, we sold Prime Outlets — Jeffersonville for $134.0 million, resulting in a net gain of $6.6 million.

Development Activity

        New Domestic Development, Expansions and Renovations.    In August 2011, we began construction on Tanger Outlets — Galveston located in Texas City, Texas. This new center is a joint venture with Tanger Factory Outlets Centers, Inc. in which we have a 50% interest. Our estimated share of the cost of this project is $32.2 million.

        During 2010, we began construction on Merrimack Premium Outlets located in Merrimack, New Hampshire. This new center, which is wholly owned by us, is expected to open in the second quarter of 2012. The estimated cost of this project is $144.0 million, and the carrying amount of the construction in progress as of September 30, 2011 was $79.3 million. Other than these two projects, our share of other 2011 new developments is not significant.

        In addition to new development, we incur costs related to construction for significant renovation and expansion projects at our properties. During 2011, we have reinstituted our redevelopment and expansion initiatives which were previously reduced given the downturn in the economy. Renovation and expansion projects are currently underway at numerous centers, and we expect our share of development costs for 2011 related to renovation or expansion initiatives to be approximately $350.0 million compared to approximately $124.0 million in 2010.

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        We expect to fund these capital projects with cash flows from operations. Our estimated stabilized return on invested capital ranges between 8-12% for all of our new development, expansion and renovation projects.

        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 most of our foreign investments with local currency-denominated borrowings that act as a natural hedge against fluctuations in exchange rates. Currently, our consolidated net income exposure to changes in the volatility of the Euro, Yen, Won, and other foreign currencies is not material. We expect our share of international development costs for 2011 will be approximately $80.0 million at current FX rates, primarily funded through reinvested joint venture cash flow and construction loans.

        Tosu Premium Outlets Phase III, a 52,000 square foot expansion to the Tosu Premium Outlet located in Fukuoka, Japan, opened on July 14, 2011. Ami Premium Outlets Phase II, a 93,000 square foot expansion to the Ami Premium Outlet located in Ami, Japan, is under construction. The projected net cost of these projects is ¥6.8 billion, of which our share is approximately ¥2.7 billion, or $35.5 million based on Yen:USD exchange rates. During October 2011, two additional expansion projects started construction in Japan: Rinku Phase IV, a 103,000 square foot expansion of Rinku Premium Outlets in Izumisano (Osaka), and Kobe-Sanda Phase III, a 78,000 square foot expansion of Kobe-Sanda Premium Outlets in Kobe (Osaka). We have a 40% interest in each of these projects. The projected net cost of these projects is ¥6.5 billion, of which our share is approximately ¥2.6 billion, or $34.0 million based on Yen:USD exchange rates.

        On March 17, 2011, Paju Premium Outlets, a 328,000 square foot center located in Seoul, South Korea, opened to the public. The net cost of this project was KRW 115.1 billion, of which our share is approximately KRW 57.5 billion, or $52.1 million based on KRW:USD exchange rates.

        Johor Premium Outlets, a 173,000 square foot center located in Johor, Malaysia is under construction. We have a 50% interest in this joint venture. The projected net cost of this project is approximately MYR 153 million, of which our share is approximately MYR 77 million, or $24.1 million based on MYR:USD exchange rates.

        On May 23, 2011, we and our partner, Calloway Real Estate Investment Trust, signed a Letter of Intent to develop a Premium Outlet Center in Canada. The center will be located near Toronto. Construction is expected to start in the spring of 2012.

Distributions

        We paid a distribution of $0.80 per unit in the third quarter of 2011. On October 25, 2011, we announced we will pay a distribution of $0.90 per unit and a special distribution of $0.20 per unit in the fourth quarter. Our distributions typically exceed our net income generated in any given year primarily because of depreciation, which is a "non-cash" expense. Our future distributions will be determined by Simon Property's 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

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and uncertainties. Such factors include, but are not limited to: our ability to meet debt service requirements, the availability 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, international, national, regional and local economic climates, 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, costs of common area maintenance, competitive market forces, risks related to international activities, insurance costs and coverage, terrorist activities, changes in economic and market conditions and maintenance of Simon Property's status as a real estate investment trust. We discussed these and other risks and uncertainties under the heading "Risk Factors" in our most recent Annual Report on Form 10-K. We may update that discussion in our 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 3.    Qualitative and Quantitative Disclosures About Market Risk

        Sensitivity Analysis.    We disclosed a comprehensive qualitative and quantitative analysis regarding market risk in the Management's Discussion and Analysis of Financial Condition and Results of Operations included in our 2010 Annual Report on Form 10-K. There have been no material changes in the assumptions used or results obtained regarding market risk since December 31, 2010.

Item 4.    Controls and Procedures

        Evaluation of Disclosure Controls and Procedures.    We maintain disclosure controls and procedures (as defined in Rules 13a-15(e) under the Securities Exchange Act of 1934 (the "Exchange Act")) that are designed to provide reasonable assurance that information required to be disclosed in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms, and that such information is accumulated and communicated to Simon Property's management, including the Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosures. Because of inherent limitations, disclosure controls and procedures, no matter how well designed and operated, can provide only reasonable, and not absolute, assurance that the objectives of disclosure controls and procedures are met.

        Simon Property's management, with the participation of the Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of the design and operation of our disclosure controls and procedures. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that, as of the end of the period covered by this report, our disclosure controls and procedures are effective at a reasonable assurance level.

        Changes in Internal Control Over Financial Reporting.    During the quarter ended September 30, 2011, we implemented a new financial reporting consolidation software application. The change was made to enhance the efficiency and automation of the consolidation process and related financial reporting and was not the result of any identified deficiencies in the previous consolidation process. There were no other changes in our internal control over financial reporting (as defined in Rule 13a-15(f)) that occurred during the quarter ended September 30, 2011 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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Part II — Other Information

Item 1.    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 1A.    Risk Factors

        Through the period covered by this report, there were no significant changes to the Risk Factors disclosed in "Part 1: Business" of our 2010 Annual Report on Form 10-K.

Item 5.    Other Information

        During the quarter covered by this report, the Audit Committee of Simon Property Group, Inc.'s Board of Directors approved certain audit-related, tax compliance, tax consulting and due diligence services to be provided by Ernst & Young, LLP, our 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.

Item 6.    Exhibits

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SIGNATURES

        Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

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EXHIBIT 31.1

CERTIFICATION PURSUANT TO
RULE 13a-14(a)/15d-14(a)
OF THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO
SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, David Simon, certify that:

1.

I have reviewed this quarterly report on Form 10-Q of Simon Property Group, L.P.;

2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act rules 13a-15(f) and 15d-15(f) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, 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;

(c)

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

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EXHIBIT 31.2

CERTIFICATION PURSUANT TO
RULE 13a-14(a)/15d-14(a)
OF THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO
SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Stephen E. Sterrett, certify that:

1.

I have reviewed this quarterly report on Form 10-Q of Simon Property Group, L.P.;

2.

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act rules 13a-15(f) and 15d-15(f) for the registrant and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, 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;

(c)

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of registrant's board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

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CERTIFICATION PURSUANT TO RULE 13a-14(a)/15d-14(a) OF THE SECURITIES EXCHANGE ACT OF 1934, AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

EXHIBIT 32

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

        In connection with the Quarterly Report of Simon Property Group, L.P. (the "Company") on Form 10-Q for the period ending September 30, 2011 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), each of the undersigned certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)

The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

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