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Document and Entity Information	6 Months Ended
Document and Entity Information	Jun. 30, 2013 shares
Document and Entity Information
Entity Registrant Name	SIMON PROPERTY GROUP L P /DE/
Entity Central Index Key	0001022344
Document Type	10-Q
Document Period End Date	Jun. 30, 2013
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding	0
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
ASSETS:
Investment properties at cost	$ 34,636,100	$ 34,252,521
Less - accumulated depreciation	9,544,943	9,068,388
Investment properties, net	25,091,157	25,184,133
Cash and cash equivalents	1,095,829	1,184,518
Tenant receivables and accrued revenue, net	491,388	521,301
Investment in unconsolidated entities, at equity	1,958,503	2,108,966
Investment in Klepierre, at equity	1,903,839	2,016,954
Deferred costs and other assets	1,474,421	1,570,734
Total assets	32,015,137	32,586,606
LIABILITIES:
Mortgages and unsecured indebtedness	22,687,622	23,113,007
Accounts payable, accrued expenses, intangibles, and deferred revenues	1,273,211	1,374,172
Cash distributions and losses in partnerships and joint ventures, at equity	836,265	724,744
Other liabilities	231,774	303,588
Total liabilities	25,028,872	25,515,511
Commitments and contingencies
Preferred units, various series, at liquidation value, and noncontrolling redeemable interests in properties	180,018	178,006
Partners' Equity
Preferred units, 796,948 units outstanding. Liquidation value of $39,847	44,554	44,719
General Partner, 310,334,126 and 309,903,824 units outstanding, respectively	5,790,195	5,865,884
Limited Partners, 52,124,046 and 51,952,554 units outstanding, respectively	972,527	983,363
Total partners' equity	6,807,276	6,893,966
Nonredeemable noncontrolling deficit interests in properties, net	(1,029)	(877)
Total equity	6,806,247	6,893,089
Total liabilities and equity	$ 32,015,137	$ 32,586,606

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2013	Dec. 31, 2012
Consolidated Balance Sheets
Preferred units, units outstanding	796,948	796,948
Preferred units, Liquidation value (in dollars)	$ 39,847	$ 39,847
General Partner, units outstanding	310,334,126	309,903,824
Limited Partners, units outstanding	52,124,046	51,952,554

Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
REVENUE:
Minimum rent	$ 778,159	$ 746,198	$ 1,556,066	$ 1,448,295
Overage rent	40,248	31,427	77,947	59,107
Tenant reimbursements	353,163	330,470	692,132	636,857
Management fees and other revenues	31,814	28,347	61,543	60,634
Other income	33,179	51,624	63,933	102,142
Total revenue	1,236,563	1,188,066	2,451,621	2,307,035
EXPENSES:
Property operating	117,479	116,018	227,388	220,758
Depreciation and amortization	318,638	311,863	635,272	596,972
Real estate taxes	109,409	106,777	219,114	205,479
Repairs and maintenance	27,107	26,665	56,832	52,307
Advertising and promotion	29,360	28,549	50,619	49,648
(Recovery of) provision for credit losses	(1,301)	2,906	1,433	6,451
Home and regional office costs	36,956	35,104	71,850	67,962
General and administrative	15,421	14,733	29,930	28,622
Other	18,604	21,124	36,605	37,788
Total operating expenses	671,673	663,739	1,329,043	1,265,987
OPERATING INCOME	564,890	524,327	1,122,578	1,041,048
Interest expense	(279,966)	(288,560)	(564,991)	(546,636)
Income and other taxes	(8,983)	(3,963)	(22,176)	(5,968)
Income from unconsolidated entities	56,516	29,132	110,747	59,484
Gain upon acquisition of controlling interests, sale or disposal of assets and interests in unconsolidated entities, and impairment charge on investment in unconsolidated entities, net	68,068		88,835	494,837
CONSOLIDATED NET INCOME	400,525	260,936	734,993	1,042,765
Net income attributable to noncontrolling interests	2,097	1,855	4,558	3,963
Preferred unit requirements	1,313	1,313	2,626	2,627
NET INCOME ATTRIBUTABLE TO UNITHOLDERS	397,115	257,768	727,809	1,036,175
NET INCOME ATTRIBUTABLE TO UNITHOLDERS ATTRIBUTABLE TO:
General Partner	339,936	215,445	623,074	860,855
Limited Partners	57,179	42,323	104,735	175,320
Net income attributable to unitholders	$ 397,115	$ 257,768	$ 727,809	$ 1,036,175
BASIC EARNINGS PER UNIT
Net income attributable to unitholders (in dollars per unit)	$ 1.10	$ 0.71	$ 2.01	$ 2.87
DILUTED EARNINGS PER UNIT
Net income attributable to unitholders (in dollars per unit)	$ 1.10	$ 0.71	$ 2.01	$ 2.87
Consolidated net income	$ 400,525	$ 260,936	$ 734,993	$ 1,042,765
Unrealized (loss) gain on derivative hedge agreements	(1,796)	(8,587)	5,275	3,105
Net loss reclassified from accumulated other comprehensive income into earnings	2,566	5,138	4,076	10,252
Currency translation adjustments	(22,960)	(65,453)	(21,912)	(21,511)
Changes in available-for-sale securities and other	(631)	(666)	(815)	23,869
Comprehensive income	377,704	191,368	721,617	1,058,480
Comprehensive income attributable to noncontrolling interests	2,097	1,855	4,558	3,964
Comprehensive income attributable to unitholders	$ 375,607	$ 189,513	$ 717,059	$ 1,054,516

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated Net Income	$ 734,993	$ 1,042,765
Adjustments to reconcile consolidated net income to net cash provided by operating activities -
Depreciation and amortization	653,354	620,189
Gain upon acquisition of controlling interests, sale or disposal of assets and interests in unconsolidated entities, and impairment charge on investment in unconsolidated entities, net	(88,835)	(494,837)
Straight-line rent	(21,595)	(17,211)
Equity in income of unconsolidated entities	(110,747)	(59,484)
Distributions of income from unconsolidated entities	104,499	65,307
Changes in assets and liabilities -
Tenant receivables and accrued revenue, net	50,249	80,566
Deferred costs and other assets	(11,536)	(49,131)
Accounts payable, accrued expenses, intangibles, deferred revenues and other liabilities	(77,433)	11,026
Net cash provided by operating activities	1,232,949	1,199,190
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions	(246,574)	(3,690,778)
Funding of loans to related parties	(37,773)
Repayments of loans to related parties		92,600
Capital expenditures, net	(394,290)	(343,830)
Cash from acquisitions and cash impact from the consolidation and deconsolidation of properties		91,170
Net proceeds from sale of assets	183,026	375,838
Investments in unconsolidated entities	(37,413)	(117,067)
Purchase of marketable and non-marketable securities	(19,850)	(11,252)
Proceeds from sale of marketable and non-marketable securities	47,495
Repayments of loans held for investment		76,768
Distributions of capital from unconsolidated entities and other	387,668	140,402
Net cash used in investing activities	(117,711)	(3,386,149)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of units	216	1,213,907
Distributions to noncontrolling interest holders in properties	(4,939)	(7,602)
Contributions from noncontrolling interest holders in properties	218	369
Partnership distributions	(835,747)	(704,056)
Mortgage and unsecured indebtedness proceeds, net of transaction costs	896,457	4,491,738
Mortgage and unsecured indebtedness principal payments	(1,260,132)	(2,967,548)
Net cash (used in) provided by financing activities	(1,203,927)	2,026,808
DECREASE IN CASH AND CASH EQUIVALENTS	(88,689)	(160,151)
CASH AND CASH EQUIVALENTS, beginning of period	1,184,518	798,650
CASH AND CASH EQUIVALENTS, end of period	$ 1,095,829	$ 638,499

Organization	6 Months Ended
Organization	Jun. 30, 2013
Organization
Organization	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 of 1986, as amended. REITs will generally not be liable for federal corporate income taxes as long as they continue to distribute not less than 100% of their taxable income. 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 malls, Premium Outlets®, The Mills®, and community/lifestyle centers. As of June 30, 2013, we owned or held an interest in 313 income-producing properties in the United States, which consisted of 159 malls, 65 Premium Outlets, 64 community/lifestyle centers, 13 Mills, and 12 other shopping centers or outlet centers in 38 states and Puerto Rico. Internationally, as of June 30, 2013, we had ownership interests in nine Premium Outlets in Japan, two Premium Outlets in South Korea, one Premium Outlet in Mexico, and one Premium Outlet in Malaysia. Additionally, as of June 30, 2013, we owned a 28.9% equity stake in Klépierre SA, or Klépierre, a publicly traded, Paris-based real estate company, which owns, or has an interest in, more than 260 shopping centers located in 13 countries in Europe.

Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2013
Basis of Presentation
Basis of Presentation	2. Basis of Presentation The accompanying unaudited consolidated financial statements include the accounts of all controlled 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 June 30, 2013, 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 2012 Annual Report on Form 10-K. As of June 30, 2013, we consolidated 221 wholly-owned properties and 18 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 87 properties, or the joint venture properties, as well as our investment in Klépierre, using the equity method of accounting, as we have determined we have significant influence over their operations. We manage the day-to-day operations of 71 of the 87 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 Japan, South Korea, Malaysia, and Mexico comprise 13 of the remaining 16 properties. The international properties are managed locally by joint ventures in which we share oversight responsibility with our partner. We allocate our net operating results after preferred distributions based on our partners' respective weighted average ownership. Simon Property owns a majority of our 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 85.6% and 83.1% for the six months ended June 30, 2013 and 2012, respectively. As of June 30, 2013 and December 31, 2012, Simon Property's ownership interest in us was 85.6%. 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 2013 presentation. These reclassifications had no impact on previously reported net income attributable to unitholders or earnings per unit.

Significant Accounting Policies

6 Months Ended

Jun. 30, 2013

Significant Accounting Policies

Significant Accounting Policies

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 an investment property that has 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. Net unrealized gains recorded in accumulated other comprehensive income (loss) as of June 30, 2013 and December 31, 2012 were approximately $1.8 million and $2.6 million, respectively, which represent the valuation and related currency adjustments for our marketable securities.

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. Changes in value of these securities and changes to the matching liability to employees are both recognized in earnings and, as a result, there is no impact to consolidated net income.

At June 30, 2013 and December 31, 2012, we also had investments of $16.8 million and $24.9 million, respectively, which must be used to fund the debt service requirements of mortgage debt related to an investment property that we sold. 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 June 30, 2013 and December 31, 2012, we had investments of $118.7 million and $98.9 million, respectively, in non-marketable securities that we account for under the cost method. We regularly evaluate these investments for any other-than-temporary impairment in their estimated fair value and determined that no adjustment in the carrying value was required.

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.

During 2012, we had investments in three mortgage and mezzanine loans that were repaid in their entirety during 2012. For the six months ended June 30, 2012, we earned $5.0 million in interest income on these loans.

Fair Value Measurements

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. We have no investments for which fair value is measured on a recurring basis using Level 3 inputs.

We hold marketable securities that totaled $125.1 million and $170.2 million at June 30, 2013 and December 31, 2012, respectively, and are primarily 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 $1.0 million and $1.5 million at June 30, 2013 and December 31, 2012, respectively, and a gross asset value of $4.3 million and $3.0 million at June 30, 2013 and December 31, 2012, respectively. We also have interest rate cap agreements with nominal values.

Note 6 includes a discussion of the fair value of debt measured using Level 2 inputs. Notes 5 and 9 include discussion of the fair values recorded in purchase accounting and impairment, using Level 2 and Level 3 inputs. Level 3 inputs to our purchase accounting and impairment 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. Although we may redeem the 7.5% preferred units for cash or shares of Simon Property common stock, we could be required to redeem the securities for cash because the non-cash redemption alternative requires us to deliver fully registered shares of Simon Property common stock which we may not be able to deliver depending upon the circumstances that exist at the time of redemption. 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. 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 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 units held by limited partners 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.

The remaining interests in a property or portfolio of properties 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, 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 accumulated deficit. 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 three and six months ended June 30, 2013 and 2012, no individual components of other comprehensive income (loss) were attributable to noncontrolling interests.

A rollforward of noncontrolling interests reflected in equity is as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,

	*2013*			*2012*			*2013*			*2012*
Noncontrolling nonredeemable deficit interests in properties, net — beginning of period	$	(931	)	$	(619	)	$	(877	)	$	(59,000	)
Net Income (loss) attributable to noncontrolling nonredeemable interests		23			(15	)		26			(2	)
Distributions to noncontrolling nonredeemable interestholders		(119	)		—			(178	)		(191	)
Purchase of noncontrolling interests and other		(2	)		—			—			58,559

Noncontrolling nonredeemable deficit interests in properties, net — end of period	$	(1,029	)	$	(634	)	$	(1,029	)	$	(634	)

Accumulated Other Comprehensive Income (Loss)

The changes in accumulated other comprehensive income (loss) by component consisted of the following as of June 30, 2013:

	Currency translation adjustments			Accumulated derivative losses, net			Net unrealized gains on marketable securities			*Total*

Beginning balance	$	(30,620	)	$	(78,139	)	$	2,613		$	(106,146	)
Other comprehensive income (loss) before reclassifications		(21,912	)		5,275			(815	)		(17,452	)
Amounts reclassified from accumulated other comprehensive income (loss)		—			4,076			—			4,076

Net current-period other comprehensive income (loss)		(21,912	)		9,351			(815	)		(13,376	)

Ending balance	$	(52,532	)	$	(68,788	)	$	1,798		$	(119,522	)

The reclassifications out of accumulated other comprehensive income (loss) consisted of the following as of June 30, 2013:

Details about accumulated other comprehensive income (loss) components:	Amount reclassified from accumulated other comprehensive income (loss)			Affected line item in the statement where net income is presented

Accumulated derivative losses, net	$	(4,076	)	Interest expense

	$	(4,076	)

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 may use a variety of derivative financial instruments in the normal course of business to selectively manage or hedge a portion of the risks associated with our indebtedness 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 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.

As of June 30, 2013, we had the following outstanding interest rate derivatives related to managing our interest rate risk:

*Interest Rate Derivative*	*Number of Instruments*	*Notional Amount*

Interest Rate Swaps	1	$92.7 million
Interest Rate Caps	6	$440.4 million

The carrying value of our interest rate swap agreements, at fair value, is a liability balance of $1.0 million and $1.5 million at June 30, 2013 and December 31, 2012, respectively, and is included in other liabilities. The interest rate cap agreements were of nominal value at June 30, 2013 and December 31, 2012 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 Europe. We use currency forward contracts and foreign currency denominated debt 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 ¥1.7 billion remains as of June 30, 2013 for all forward contracts that we expect to receive through January 5, 2015. The June 30, 2013 asset balance related to these forward contracts was $4.3 million and 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 currency 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 $68.8 million and $78.1 million as of June 30, 2013 and December 31, 2012, respectively.

Per Unit Data

6 Months Ended

Jun. 30, 2013

Per Unit Data

Per Unit Data

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 assuming all potentially dilutive securities 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 Three Months Ended June 30,				For the Six Months Ended June 30,

	*2013*		*2012*		*2013*		*2012*
Net Income attributable to Unitholders — Basic & Diluted	$	397,115	$	257,768	$	727,809	$	1,036,175

Weighted Average Units Outstanding — Basic		362,455,413		364,300,150		362,254,663		360,463,043
Effect of stock options of Simon Property		—		1,042		103		1,079

Weighted Average Units Outstanding — Diluted		362,455,413		364,301,192		362,254,766		360,464,122

For the six months ended June 30, 2013, potentially dilutive securities include options to purchase shares of Simon Property common stock and long-term incentive performance units, or LTIP units. The only security that had a dilutive effect for the six months ended June 30, 2013 and 2012 were stock options of Simon Property. We accrue distributions when they are declared.

Investment in Unconsolidated Entities

6 Months Ended

Jun. 30, 2013

Investment in Unconsolidated Entities

Investment in Unconsolidated Entities

5. Investment in Unconsolidated Entities

Real Estate Joint Ventures and Investments

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 74 properties in the United States as of June 30, 2013 and 78 properties as of December 31, 2012. We held interests in nine joint venture properties in Japan as of June 30, 2013 and eight joint venture properties as of December 31, 2012. At June 30, 2013 and December 31, 2012, we also held interests in two joint venture properties in South Korea, one joint venture property in Mexico, and one joint venture property in Malaysia. We account for these joint venture properties using the equity method of accounting. As discussed below, on January 9, 2012, we sold our interest in Gallerie Commerciali Italia, S.p.A., or GCI, which at the time owned 45 properties located in Italy. On March 14, 2012, we purchased a 28.7% equity stake in Klépierre. On May 21, 2012, Klépierre paid a dividend, which we elected to receive in additional shares, resulting in an increase in our ownership to approximately 28.9%.

Certain of our joint venture properties are subject to various rights of first refusal, buy-sell provisions, put and call rights, 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 (subject to any applicable lock up or similar restrictions), which may result in either the sale of our interest or the use of available cash or borrowings or units to acquire the joint venture interest from our partner.

Unconsolidated Property Transactions

On December 31, 2012, we formed a joint venture with Institutional Mall Investors, or IMI, to own and operate The Shops at Mission Viejo in the Los Angeles suburb of Mission Viejo, California, and Woodfield Mall in the Chicago suburb of Schaumburg, Illinois. We and IMI each own a noncontrolling 50% interest in Woodfield Mall and we own a noncontrolling 51% interest in The Shops at Mission Viejo and IMI owns the remaining 49%. Prior to the formation of the joint venture, we owned 100% of The Shops at Mission Viejo and IMI owned 100% of Woodfield Mall. No gain was recorded as the transaction was recorded based on the carryover basis of our previous investment. Woodfield Mall is encumbered by a $425 million mortgage loan which matures in March of 2024 and bears interest at 4.5%. In January 2013, the joint venture closed a $295 million mortgage on the Shops at Mission Viejo which bears interest at 3.61% and matures in February of 2023. The proceeds from the financing were distributed to the venture partners and, as a result, we received a distribution of $149.7 million.

On March 22, 2012, we acquired, through an acquisition of substantially all of the assets of The Mills Limited Partnership, or TMLP, additional interests in 26 properties, or the Mills transaction. The transaction resulted in additional interests in 16 of the properties which remain unconsolidated, the consolidation of nine previously unconsolidated properties and the purchase of the remaining noncontrolling interest in a previously consolidated property. The transaction was valued at $1.5 billion, which included repayment of the remaining $562.1 million balance on TMLP's senior loan facility, and retirement of $100.0 million of TMLP's trust preferred securities. In connection with the transaction, our $558.4 million loan to SPG-FCM Ventures, LLC, or SPG-FCM, was extinguished on a non-cash basis. We consolidated $2.6 billion in additional property-level mortgage debt in connection with this transaction. This property-level mortgage debt was previously presented as debt of our unconsolidated entities. We and our joint venture partner had equal ownership in these properties prior to the transaction.

The consolidation of the previously unconsolidated properties resulted in a remeasurement of our previously held interests in these nine newly consolidated properties to fair value and recognition of a corresponding non-cash gain of $488.7 million. In addition, we recorded an other-than-temporary impairment charge of $22.4 million for the excess of carrying value of our remaining investment in SPG-FCM over its estimated fair value. The gain on the transaction and impairment charge are included in gain upon acquisition of controlling interests, sale or disposal of assets and interests in unconsolidated entities, and impairment charge on investment in unconsolidated entities, net in the accompanying consolidated statements of operations and comprehensive income. The assets and liabilities of the newly consolidated properties acquired in the Mills transaction have been reflected at their estimated fair value at the acquisition date.

We recorded our acquisition of the interests in the nine newly consolidated properties using the acquisition method of accounting. Tangible and intangible assets and liabilities were established based on their fair values at the date of acquisition. The results of operations of the newly consolidated properties have been included in our consolidated results from the date of acquisition. The purchase price allocations were finalized during the first quarter of 2013. No significant adjustments were made to the previously reported purchase price allocations.

On January 6, 2012, we paid $50.0 million to acquire an additional interest in Del Amo Fashion Center, increasing our interest in the property to 50%.

European Investments

At June 30, 2013, we owned 57,634,148 shares, or approximately 28.9%, of Klépierre, which had a quoted market price of $39.47 per share. At the date of purchase on March 14, 2012, our excess investment in Klépierre was approximately $1.2 billion which we have allocated to the underlying investment property, other assets and liabilities based on estimated fair value. Our share of net income, net of amortization of our excess investment, was $23.3 million for the six months ended June 30, 2013. Based on applicable Euro:USD exchange rates and after our conversion of Klépierre's results to GAAP, Klépierre's total revenues, operating income and consolidated net income were approximately $725.6 million, $282.9 million and $97.9 million, respectively, for the six months ended June 30, 2013. Our share of the results of Klépierre from the date of acquisition through June 30, 2012 was nominal.

During the second quarter of 2013, we signed a definitive agreement to form joint ventures to invest in certain assets of McArthurGlen, an owner, developer and manager of designer outlets in Europe. Subject to customary closing conditions, we intend to acquire an ownership interest in certain outlet centers located throughout Europe as well as one development project located in Vancouver, Canada, and become a partner in McArthurGlen's property management and development companies. As of June 30, 2013, we have completed the initial phase of the transaction and made an equity investment of $38.7 million, which includes a 50% ownership interest in the property management and development companies and a 45% ownership interest in the development project.

We also have a minority interest in Value Retail PLC, which owns and operates nine luxury outlets throughout Europe and a direct minority ownership in three of those outlets. These investments are accounted for under the cost method. At June 30, 2013 and December 31, 2012, the carrying value of these investments was $115.3 and $95.5 million, respectively, and is included in deferred costs and other assets.

On January 9, 2012, we sold our entire ownership interest in GCI to our venture partner, Auchan S.A. The aggregate cash we received was $375.8 million, and we recognized a gain on the sale of $28.8 million. Our investment carrying value included $39.5 million of accumulated losses related to currency translation and net investment hedge accumulated balances, which had been recorded in 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 $275.0 million and $314.2 million as of June 30, 2013 and December 31, 2012, respectively, including all related components of accumulated other comprehensive income (loss). We conduct our international Premium Outlet operations in South 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 $67.1 million and $62.9 million as of June 30, 2013 and December 31, 2012, respectively; including all related components of accumulated other comprehensive income (loss).

Summary Financial Information

A summary of our equity method investments and share of income from such investments, excluding Klépierre, follows. We acquired additional controlling interests in nine properties in the Mills transaction on March 22, 2012. These previously unconsolidated properties became consolidated properties as of their acquisition date. During 2012, we disposed of our joint venture interests in one mall and three retail properties. The results of operations of the properties for all of these 2012 transactions are classified as loss from operations of discontinued joint venture interests in the accompanying joint venture statements of operations. In 2013, we disposed of one retail property. The gain on disposal is reported in gain on disposal of discontinued operations, net in the accompanying joint venture statements of operations. Balance sheet information for these investments is as follows:

	June 30, 2013		December 31, 2012

BALANCE SHEETS
Assets:
Investment properties, at cost	$	14,621,714	$	14,607,291
Less — accumulated depreciation		5,027,179		4,926,511

		9,594,535		9,680,780
Cash and cash equivalents		551,059		619,546
Tenant receivables and accrued revenue, net		225,178		252,774
Investment in unconsolidated entities, at equity		38,958		39,589
Deferred costs and other assets		707,343		438,399

Total assets	$	11,117,073	$	11,031,088

Liabilities and Partners' Deficit:
Mortgages	$	11,964,864	$	11,584,863
Accounts payable, accrued expenses, intangibles, and deferred revenue		596,283		672,483
Other liabilities		657,205		447,132

Total liabilities		13,218,352		12,704,478
Preferred units		67,450		67,450
Partners' deficit		(2,168,729)		(1,740,840)

Total liabilities and partners' deficit	$	11,117,073	$	11,031,088

Our Share of:
Partners' deficit	$	(992,395)	$	(799,911)
Add: Excess Investment		2,114,633		2,184,133

Our net Investment in unconsolidated entities, at equity	$	1,122,238	$	1,384,222

"Excess Investment" represents the unamortized difference of our investment over our share of the equity in the underlying net assets of the joint ventures or other investments acquired and is allocated on a fair value basis primarily to investment property, lease related intangibles, and debt premiums and discounts. We amortize excess investment over the life of the related depreciable components of investment property, typically no greater than 40 years, the terms of the applicable leases and the applicable debt maturity, respectively. The amortization is included in the reported amount of income from unconsolidated entities.

	*For the Three Months Ended June 30,*				*For the Six Months Ended June 30,*

	*2013*		*2012*		*2013*		*2012*
STATEMENT OF OPERATIONS
Revenue:
Minimum rent	$	399,391	$	363,541	$	793,544	$	721,517
Overage rent		40,014		36,064		87,781		84,620
Tenant reimbursements		187,151		165,623		371,550		332,153
Other income		39,528		36,597		81,602		86,934

Total revenue		666,084		601,825		1,334,477		1,225,224
Operating Expenses:
Property operating		123,296		111,967		239,165		226,801
Depreciation and amortization		126,701		122,475		254,386		249,453
Real estate taxes		50,072		42,450		104,778		87,550
Repairs and maintenance		16,339		15,427		32,503		29,851
Advertising and promotion		14,103		12,688		30,023		27,895
Provision for (Recovery of) credit losses		336		(793)		1,580		399
Other		36,496		38,549		72,181		92,043

Total operating expenses		367,343		342,763		734,616		713,992

Operating Income		298,741		259,062		599,861		511,232
Interest expense		(154,508)		(148,980)		(301,994)		(302,690)

Income from Continuing Operations		144,233		110,082		297,867		208,542
Loss from operations of discontinued joint venture interests		(26)		(5,280)		(346)		(18,791)
Gain on disposal of discontinued operations, net		18,356		—		18,356		—

Net Income	$	162,563	$	104,802	$	315,877	$	189,751

Third-Party Investors' Share of Net Income	$	94,949	$	56,787	$	178,715	$	96,800

Our Share of Net Income		67,614		48,015		137,162		92,951
Amortization of Excess Investment		(24,853)		(18,749)		(49,682)		(33,333)

Income from Unconsolidated Entities	$	42,761	$	29,266	$	87,480	$	59,618

Our share of income from unconsolidated entities in the above table, aggregated with our share of the results of Klépierre, is presented in Income from unconsolidated entities in the accompanying consolidated statements of operations and comprehensive income.

- Definition

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

+ References + Details

Debt

6 Months Ended

Jun. 30, 2013

Debt

Debt

6. Debt

Unsecured Debt

At June 30, 2013, our unsecured debt consisted of $13.0 billion of senior unsecured notes, $1.2 billion outstanding under our $4.0 billion unsecured revolving credit facility, or Credit Facility, $226.1 million outstanding under our $2.0 billion supplemental unsecured revolving credit facility, or Supplemental Facility, and $240.0 million outstanding under an unsecured term loan. The entire balance on the Credit Facility at June 30, 2013 consisted of Euro-denominated borrowings and the entire balance on the Supplemental Facility on such date consisted of Yen-denominated borrowings, both of which are designated as net investment hedges of our international investments.

On June 30, 2013, we had an aggregate available borrowing capacity of $4.6 billion under the two credit facilities. The maximum outstanding balance of the credit facilities during the six months ended June 30, 2013 was $1.6 billion and the weighted average outstanding balance was $1.5 billion. Letters of credit of $45.1 million were outstanding under the two credit facilities as of June 30, 2013.

The Credit Facility's initial borrowing capacity of $4.0 billion can be increased at our sole option to $5.0 billion during its term. The Credit Facility will initially mature on October 30, 2015 and can be extended for an additional year at our sole option. As of June 30, 2013, the base interest rate on the Credit Facility is LIBOR plus 95 basis points (reflects a five basis point reduction effective May 16, 2013) with an additional facility fee of 15 basis points. In addition, the Credit 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 Credit Facility also includes a $2.0 billion multi-currency tranche.

The Supplemental Facility's borrowing capacity of $2.0 billion can be increased at our sole option to $2.5 billion during its term. The Supplemental Facility will initially mature on June 30, 2016 and can be extended for an additional year at our sole option. As of June 30, 2013, the base interest rate on the Supplemental Facility is LIBOR plus 95 basis points (reflects a five basis point reduction effective May 16, 2013) with an additional facility fee of 15 basis points. Like the Credit Facility, the Supplemental Facility provides for a money market competitive bid option program and allows for multi-currency borrowings.

During the six months ended June 30, 2013, we redeemed at par or repaid at maturity $429.5 million of senior unsecured notes with fixed rates ranging from 5.30% to 6.00% with cash on hand. In addition, we repaid a $240.0 million mortgage loan with the proceeds from a $240.0 million unsecured term loan. The term loan has a capacity of up to $300.0 million, bears interest at LIBOR plus 110 basis points and matures on February 28, 2016 with two available one-year extension options.

Mortgage Debt

Total mortgage indebtedness was $8.0 billion at June 30, 2013 and December 31, 2012.

Covenants

Our unsecured debt agreements contain 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 June 30, 2013, we are in compliance with all covenants of our unsecured debt.

At June 30, 2013, we or our subsidiaries are the borrowers under 79 non-recourse mortgage notes secured by mortgages on 79 properties, including seven separate pools of cross-defaulted and cross-collateralized mortgages encumbering a total of 27 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 instruments contain 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 June 30, 2013, 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 in the aggregate, 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 unsecured indebtedness was $20.9 billion and $21.0 billion as of June 30, 2013 and December 31, 2012, respectively. The fair values of these financial instruments and the related discount rate assumptions as of June 30, 2013 and December 31, 2012 are summarized as follows:

	*June 30, 2013*		*December 31, 2012*

Fair value of fixed-rate mortgages and unsecured indebtedness	$	22,396	$	23,373
Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages		3.68%		3.24%

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Equity

6 Months Ended

Jun. 30, 2013

Equity

Equity

7. Equity

During the six months ended June 30, 2013, 10 limited partners exchanged 318,162 units for an equal number of shares of common stock of Simon Property pursuant to our partnership agreement. These transactions increased Simon Property's ownership interest in us.

Stock Based Compensation

Awards under our stock based compensation plans primarily take the form of LTIP units and restricted stock grants made under our 1998 Stock Incentive Plan, or the Plan. These awards are all performance based and are based on various corporate and business unit performance measures as further described below. In the aggregate, we recorded compensation expense, net of capitalization, related to these stock based compensation arrangements of approximately $27.1 million and $23.4 million for the six months ended June 30, 2013 and 2012, respectively, which is included within home and regional office costs and general and administrative costs in the accompanying statements of operations and comprehensive income.

LTIP Programs. On March 16, 2010, the Compensation Committee of Simon Property's Board of Directors, or the Compensation Committee, approved three long-term, performance based incentive compensation programs, or the 2010 LTIP programs, for certain senior executive officers. Awards under the LTIP programs take the form of LTIP units, a form of limited partnership interest issued by the Operating Partnership, and will be considered earned if, and only to the extent to which, applicable total shareholder return, or TSR, performance measures are achieved during the performance period. Once earned, LTIP units will become the equivalent of units only after a two year service-based vesting period, beginning after the end of the performance period. Awarded LTIP units not earned are forfeited. 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 of the Operating Partnership. As a result, we account for these LTIP units as participating securities under the two-class method of computing earnings per unit. The 2010 LTIP programs had one, two and three year performance periods, which ended on December 31, 2010, 2011 and 2012, respectively.

In the first quarter of 2011, the Compensation Committee determined the extent to which the performance measures had been achieved and 133,673 LTIP units were earned under the one-year 2010 LTIP program and, pursuant to the award agreements, vested in two equal installments in 2012 and 2013. In the first quarter of 2012, the Compensation Committee determined the extent to which the performance measures had been achieved and 337,006 LTIP units were earned under the two-year 2010 LTIP program and, pursuant to the award agreements, will vest in two equal installments in 2013 and 2014. In the first quarter of 2013, the Compensation Committee determined the extent to which the performance measures had been achieved and 489,654 LTIP units were earned under the three-year 2010 LTIP program and, pursuant to the award agreements entered into with program participants, the earned LTIP units will vest in two equal installments in 2014 and 2015, subject to the conditions described in those agreements.

During July 2011, the Compensation Committee approved a new three-year long-term performance based incentive compensation 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.

During March 2012, the Compensation Committee approved a three-year long-term performance based incentive compensation program, or the 2012-2014 LTIP program, and awarded LTIP units to certain senior executive officers. The 2012-2014 LTIP program has a three year performance period ending December 31, 2014 and units awarded under that program will be considered earned if, and only to the extent to which, applicable TSR performance measures are achieved during the performance period. 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.

During February 2013, the Compensation Committee approved a three-year long-term performance based incentive compensation program, or the 2013-2015 LTIP program, and awarded LTIP units to certain senior executive officers. The 2013-2015 LTIP program has a three year performance period ending December 31, 2015 and units awarded under that program will be considered earned if, and only to the extent to which, applicable TSR performance measures are achieved during the performance period. 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. Both the 2011-2013 LTIP program and 2012-2014 LTIP program have aggregate grant date fair values of $35.0 million, adjusted for estimated forfeitures. The 2013-2015 LTIP program has an aggregate grant date fair value of $33.5 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 performance measures are achieved, if the required service is delivered. 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.

Restricted Stock. The Compensation Committee awarded an aggregate of 107,528 shares of restricted stock to employees on February 25, 2013, April 1, 2013 and June 6, 2013 under the Plan, at a fair market value of $157.37 per share, $159.32 per share and $166.56 per share, respectively. On May 14, 2013, Simon Property's non-employee Directors were awarded 3,487 shares of restricted stock under the Plan at a fair market value of $179.23 per share. The fair market value of the Simon Property restricted stock awarded on February 25, 2013, April 1, 2013 and June 6, 2013 is being recognized as expense over the three-year vesting service period. The fair market value of the restricted stock awarded on May 14, 2013 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 that are subject to the same vesting conditions as the restricted stock.

Other Compensation Arrangements. 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 term of his employment agreement on a straight-line basis.

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:

	*Preferred Units*		*Simon Property (Managing General Partner)*		*Limited Partners*		*Noncontrolling interests*		*Total Equity*

January 1, 2013	$	44,719	$	5,865,884	$	983,363	$	(877)	$	6,893,089
Limited partner units exchanged to units				5,982		(5,982)				—
Other		(165)		9,632		22,531				31,998
Adjustment to limited partners' interest from increased ownership in the Operating Partnership				10,442		(10,442)				—
Distributions to limited partners, excluding preferred interests classified as temporary equity		(1,669)		(713,392)		(119,729)		(178)		(834,968)
Comprehensive income, excluding $957 attributable to preferred distributions on temporary equity preferred units and $4,532 attributable to noncontrolling redeemable interests in properties in temporary equity		1,669		611,647		102,786		26		716,128

June 30, 2013	$	44,554	$	5,790,195	$	972,527	$	(1,029)	$	6,806,247

- Definition

The entire disclosure for the formation, structure, control and ownership of the partnership. Disclosures related to accounts comprising partners' capital. Includes balances of general partners' capital account, limited partners' capital account, preferred partners' capital account and total partners' capital account and units outstanding; accumulated other comprehensive income; amount and nature of changes to amount of partner's capital and units outstanding by class, rights and privileges for each class of units; distribution policies and distributions paid by unit class; impact of and correction of an error in previously issued financial statements; limitations of partners' liability; redemption, conversion and distribution policies; and deferred compensation related to the issuance of units.

+ References + Details

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2013
Commitments and Contingencies
Commitments and Contingencies	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. In May 2010, Opry Mills sustained significant flood damage. Insurance proceeds of $50 million have been funded by the insurers, remediation work has been completed and the property was re-opened March 29, 2012. The excess insurance carriers (those providing coverage above $50 million) have denied the claim under the policy for additional proceeds (of up to $150 million) to pay further amounts for restoration costs and business interruption losses. 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. *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 June 30, 2013 and December 31, 2012, we guaranteed joint venture related mortgage indebtedness of $142.7 million and $84.9 million, respectively (of which we have a right of recovery from our venture partners of $66.1 million and $38.6 million, respectively). Mortgages guaranteed by us are secured by the property of the joint venture which could be sold in order to satisfy the outstanding obligation and which have an estimated fair value in excess of the guaranteed amount. *Concentration of Credit Risk* Our malls, Premium Outlets, The Mills, and community/lifestyle centers rely heavily upon anchor tenants to attract customers; however anchor retailers do not contribute materially to our financial results as many anchor retailers own their spaces. All material operations are within the United States and no customer or tenant accounts for 5% or more of our consolidated revenues.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25287-109308

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Real Estate Acquisitions and Dispositions	6 Months Ended
Real Estate Acquisitions and Dispositions	Jun. 30, 2013
Real Estate Acquisitions and Dispositions
Real Estate Acquisitions and Dispositions	9. Real Estate Acquisitions and Dispositions During the first six months of 2013, we increased our economic interest in three unconsolidated community centers and subsequently disposed of our interests in those properties. Additionally, we disposed of our interests in two consolidated retail properties and one unconsolidated retail property. The aggregate gain recognized on these transactions was approximately $61.5 million. On May 30, 2013 we acquired a 100% interest in a 390,000 square foot outlet center located near Portland, Oregon for cash consideration of $146.7 million. The fair value of the acquisition was recorded primarily as investment property and lease related intangibles. As part of this transaction, we recognized a gain of approximately $27.3 million. During 2012, we disposed of our interest in nine consolidated retail properties and four unconsolidated retail properties. Our share of the net gain on these disposals was $15.5 million. On May 3, 2012, we sold our interests in two residential apartment buildings located at The Domain in Austin, Texas. Our share of the gain from the sale was $12.4 million which is included in other income in the accompanying 2012 consolidated statement of operations and comprehensive income. On December 31, 2012, as discussed in Note 5, we contributed a wholly-owned property to a newly formed joint venture in exchange for an interest in a property contributed to the same joint venture by our joint venture partner. On December 4, 2012, we acquired the remaining 50% noncontrolling equity interest in two previously consolidated outlet properties located in Grand Prairie, Texas and Livermore, California and accordingly, we now own 100% of these properties. We paid consideration of $260.9 million for the additional interest in the properties, 90% of which was paid in cash and 10% of which was satisfied through the issuance of units. In addition, the construction loans we had provided to the properties totaling $162.5 million were extinguished on a non-cash basis. The transaction was accounted for as an equity transaction, as the properties had been previously consolidated. On June 4, 2012, we acquired a 50% interest in a 465,000 square foot outlet center located in Destin, Florida for $70.5 million. On March 22, 2012, as discussed in Note 5, we acquired, through an acquisition of substantially all of the assets of TMLP, additional interests in 26 of our joint venture properties in a transaction valued at approximately $1.5 billion. On March 14, 2012, as discussed in Note 5, we acquired a 28.7% equity stake in Klépierre for approximately $2.0 billion, including the capitalization of acquisition costs. On January 9, 2012, as discussed in Note 5, we sold our entire ownership interest in GCI. On January 6, 2012, we paid $50.0 million to acquire an additional interest in Del Amo Fashion Center, thereby increasing our interest to 50%. Unless otherwise noted, gains and losses on the above transactions are included in gain upon acquisition of controlling interests, sale or disposal of assets and interests in unconsolidated entities, and impairment charge on investment in unconsolidated entities, net in the accompanying consolidated statements of operations and comprehensive income. We expense acquisition and potential acquisition costs related to business combinations and disposition related costs as they are incurred. We incurred a minimal amount of transaction expenses during the six months ended June 30, 2013 and 2012.

Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2013

Significant Accounting Policies

Cash and Cash Equivalents

Cash and Cash Equivalents

Marketable and Non-Marketable Securities

Marketable and Non-Marketable Securities

Loans Held for Investment

Loans Held for Investment

Fair Value Measurements

Fair Value Measurements

Noncontrolling Interests and Temporary Equity

Noncontrolling Interests and Temporary Equity

A rollforward of noncontrolling interests reflected in equity is as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,

	*2013*			*2012*			*2013*			*2012*
Noncontrolling nonredeemable deficit interests in properties, net — beginning of period	$	(931	)	$	(619	)	$	(877	)	$	(59,000	)
Net Income (loss) attributable to noncontrolling nonredeemable interests		23			(15	)		26			(2	)
Distributions to noncontrolling nonredeemable interestholders		(119	)		—			(178	)		(191	)
Purchase of noncontrolling interests and other		(2	)		—			—			58,559

Noncontrolling nonredeemable deficit interests in properties, net — end of period	$	(1,029	)	$	(634	)	$	(1,029	)	$	(634	)

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

The changes in accumulated other comprehensive income (loss) by component consisted of the following as of June 30, 2013:

	Currency translation adjustments			Accumulated derivative losses, net			Net unrealized gains on marketable securities			*Total*

Beginning balance	$	(30,620	)	$	(78,139	)	$	2,613		$	(106,146	)
Other comprehensive income (loss) before reclassifications		(21,912	)		5,275			(815	)		(17,452	)
Amounts reclassified from accumulated other comprehensive income (loss)		—			4,076			—			4,076

Net current-period other comprehensive income (loss)		(21,912	)		9,351			(815	)		(13,376	)

Ending balance	$	(52,532	)	$	(68,788	)	$	1,798		$	(119,522	)

The reclassifications out of accumulated other comprehensive income (loss) consisted of the following as of June 30, 2013:

Details about accumulated other comprehensive income (loss) components:	Amount reclassified from accumulated other comprehensive income (loss)			Affected line item in the statement where net income is presented

Accumulated derivative losses, net	$	(4,076	)	Interest expense

	$	(4,076	)

Derivative Financial Instruments

Derivative Financial Instruments

As of June 30, 2013, we had the following outstanding interest rate derivatives related to managing our interest rate risk:

*Interest Rate Derivative*	*Number of Instruments*	*Notional Amount*

Interest Rate Swaps	1	$92.7 million
Interest Rate Caps	6	$440.4 million

- Definition

Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.

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- Definition

Disclosure of accounting policy for its derivative instruments and hedging activities.

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Disclosure of accounting policy for investments in financial assets, including marketable securities (debt and equity securities with readily determinable fair values), investments accounted for under the equity method and cost method, securities borrowed and loaned, and repurchase and resale agreements. For marketable securities, the disclosure may include the entity's accounting treatment for transfers between investment categories and how the fair values for such securities are determined. Also, for all investments, an entity may describe its policy for assessing, recognizing and measuring impairment of the investment.

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+ Details

Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2013

Significant Accounting Policies

Schedule of rollforward of noncontrolling interests

	For the Three Months Ended June 30,						For the Six Months Ended June 30,

	*2013*			*2012*			*2013*			*2012*
Noncontrolling nonredeemable deficit interests in properties, net — beginning of period	$	(931	)	$	(619	)	$	(877	)	$	(59,000	)
Net Income (loss) attributable to noncontrolling nonredeemable interests		23			(15	)		26			(2	)
Distributions to noncontrolling nonredeemable interestholders		(119	)		—			(178	)		(191	)
Purchase of noncontrolling interests and other		(2	)		—			—			58,559

Noncontrolling nonredeemable deficit interests in properties, net — end of period	$	(1,029	)	$	(634	)	$	(1,029	)	$	(634	)

Schedule of changes in accumulated other comprehensive income (loss) by component

	Currency translation adjustments			Accumulated derivative losses, net			Net unrealized gains on marketable securities			*Total*

Beginning balance	$	(30,620	)	$	(78,139	)	$	2,613		$	(106,146	)
Other comprehensive income (loss) before reclassifications		(21,912	)		5,275			(815	)		(17,452	)
Amounts reclassified from accumulated other comprehensive income (loss)		—			4,076			—			4,076

Net current-period other comprehensive income (loss)		(21,912	)		9,351			(815	)		(13,376	)

Ending balance	$	(52,532	)	$	(68,788	)	$	1,798		$	(119,522	)

Schedule of reclassifications out of accumulated other comprehensive income (loss)

Details about accumulated other comprehensive income (loss) components:	Amount reclassified from accumulated other comprehensive income (loss)			Affected line item in the statement where net income is presented

Accumulated derivative losses, net	$	(4,076	)	Interest expense

	$	(4,076	)

Schedule of outstanding interest rate derivatives related to interest rate risk

*Interest Rate Derivative*	*Number of Instruments*	*Notional Amount*

Interest Rate Swaps	1	$92.7 million
Interest Rate Caps	6	$440.4 million

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

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+ Details

Per Unit Data (Tables)

6 Months Ended

Jun. 30, 2013

Per Unit Data

Schedule of computation of basic and diluted earnings per unit

	For the Three Months Ended June 30,				For the Six Months Ended June 30,

	*2013*		*2012*		*2013*		*2012*
Net Income attributable to Unitholders — Basic & Diluted	$	397,115	$	257,768	$	727,809	$	1,036,175

Weighted Average Units Outstanding — Basic		362,455,413		364,300,150		362,254,663		360,463,043
Effect of stock options of Simon Property		—		1,042		103		1,079

Weighted Average Units Outstanding — Diluted		362,455,413		364,301,192		362,254,766		360,464,122

Investment in Unconsolidated Entities (Tables)

6 Months Ended

Jun. 30, 2013

Investment in Unconsolidated Entities

Summary of equity method investments and share of income from such investments, balance sheet

	June 30, 2013		December 31, 2012

BALANCE SHEETS
Assets:
Investment properties, at cost	$	14,621,714	$	14,607,291
Less — accumulated depreciation		5,027,179		4,926,511

		9,594,535		9,680,780
Cash and cash equivalents		551,059		619,546
Tenant receivables and accrued revenue, net		225,178		252,774
Investment in unconsolidated entities, at equity		38,958		39,589
Deferred costs and other assets		707,343		438,399

Total assets	$	11,117,073	$	11,031,088

Liabilities and Partners' Deficit:
Mortgages	$	11,964,864	$	11,584,863
Accounts payable, accrued expenses, intangibles, and deferred revenue		596,283		672,483
Other liabilities		657,205		447,132

Total liabilities		13,218,352		12,704,478
Preferred units		67,450		67,450
Partners' deficit		(2,168,729)		(1,740,840)

Total liabilities and partners' deficit	$	11,117,073	$	11,031,088

Our Share of:
Partners' deficit	$	(992,395)	$	(799,911)
Add: Excess Investment		2,114,633		2,184,133

Our net Investment in unconsolidated entities, at equity	$	1,122,238	$	1,384,222

Summary of equity method investments and share of income from such investments, statement of operations

	*For the Three Months Ended June 30,*				*For the Six Months Ended June 30,*

	*2013*		*2012*		*2013*		*2012*
STATEMENT OF OPERATIONS
Revenue:
Minimum rent	$	399,391	$	363,541	$	793,544	$	721,517
Overage rent		40,014		36,064		87,781		84,620
Tenant reimbursements		187,151		165,623		371,550		332,153
Other income		39,528		36,597		81,602		86,934

Total revenue		666,084		601,825		1,334,477		1,225,224
Operating Expenses:
Property operating		123,296		111,967		239,165		226,801
Depreciation and amortization		126,701		122,475		254,386		249,453
Real estate taxes		50,072		42,450		104,778		87,550
Repairs and maintenance		16,339		15,427		32,503		29,851
Advertising and promotion		14,103		12,688		30,023		27,895
Provision for (Recovery of) credit losses		336		(793)		1,580		399
Other		36,496		38,549		72,181		92,043

Total operating expenses		367,343		342,763		734,616		713,992

Operating Income		298,741		259,062		599,861		511,232
Interest expense		(154,508)		(148,980)		(301,994)		(302,690)

Income from Continuing Operations		144,233		110,082		297,867		208,542
Loss from operations of discontinued joint venture interests		(26)		(5,280)		(346)		(18,791)
Gain on disposal of discontinued operations, net		18,356		—		18,356		—

Net Income	$	162,563	$	104,802	$	315,877	$	189,751

Third-Party Investors' Share of Net Income	$	94,949	$	56,787	$	178,715	$	96,800

Our Share of Net Income		67,614		48,015		137,162		92,951
Amortization of Excess Investment		(24,853)		(18,749)		(49,682)		(33,333)

Income from Unconsolidated Entities	$	42,761	$	29,266	$	87,480	$	59,618

Debt (Tables)

6 Months Ended

Jun. 30, 2013

Debt

Schedule of fair value of fixed rate mortgages and unsecured indebtedness

	*June 30, 2013*		*December 31, 2012*

Fair value of fixed-rate mortgages and unsecured indebtedness	$	22,396	$	23,373
Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages		3.68%		3.24%

Equity (Tables)

6 Months Ended

Jun. 30, 2013

Equity

Reconciliation of carrying amounts of equity

	*Preferred Units*		*Simon Property (Managing General Partner)*		*Limited Partners*		*Noncontrolling interests*		*Total Equity*

January 1, 2013	$	44,719	$	5,865,884	$	983,363	$	(877)	$	6,893,089
Limited partner units exchanged to units				5,982		(5,982)				—
Other		(165)		9,632		22,531				31,998
Adjustment to limited partners' interest from increased ownership in the Operating Partnership				10,442		(10,442)				—
Distributions to limited partners, excluding preferred interests classified as temporary equity		(1,669)		(713,392)		(119,729)		(178)		(834,968)
Comprehensive income, excluding $957 attributable to preferred distributions on temporary equity preferred units and $4,532 attributable to noncontrolling redeemable interests in properties in temporary equity		1,669		611,647		102,786		26		716,128

June 30, 2013	$	44,554	$	5,790,195	$	972,527	$	(1,029)	$	6,806,247

Organization (Details)	Jun. 30, 2013 item property country	Dec. 31, 2012 property
U.S. and Puerto Rico
Owned, developed and managed retail properties
Number of income-producing properties	313
Number of U.S. states containing property locations \| item	38
U.S. and Puerto Rico \| Malls
Owned, developed and managed retail properties
Number of income-producing properties	159
U.S. and Puerto Rico \| Premium Outlets
Owned, developed and managed retail properties
Number of income-producing properties	65
U.S. and Puerto Rico \| Community/Lifestyle Centers
Owned, developed and managed retail properties
Number of income-producing properties	64
U.S. and Puerto Rico \| The Mills
Owned, developed and managed retail properties
Number of income-producing properties	13
U.S. and Puerto Rico \| Other shopping centers or outlet centers
Owned, developed and managed retail properties
Number of income-producing properties	12
Japan
Owned, developed and managed retail properties
Number of income-producing properties	9	8
Japan \| Premium Outlets
Owned, developed and managed retail properties
Number of income-producing properties	9
South Korea
Owned, developed and managed retail properties
Number of income-producing properties	2	2
South Korea \| Premium Outlets
Owned, developed and managed retail properties
Number of income-producing properties	2
Mexico
Owned, developed and managed retail properties
Number of income-producing properties	1	1
Mexico \| Premium Outlets
Owned, developed and managed retail properties
Number of income-producing properties	1
Malaysia
Owned, developed and managed retail properties
Number of income-producing properties	1	1
Malaysia \| Premium Outlets
Owned, developed and managed retail properties
Number of income-producing properties	1
Europe
Owned, developed and managed retail properties
Interest in income-producing properties, under joint venture arrangements (as a percent)	28.90%
Number of countries \| country	13
Europe \| Shopping centers \| Minimum
Owned, developed and managed retail properties
Number of income-producing properties	260

Basis of Presentation (Details) - property	6 Months Ended
Basis of Presentation (Details) - property	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Properties
Wholly owned properties included in consolidation	221
Partially owned properties included in consolidation	18
Total number of joint venture properties	87
Number of joint venture properties managed by the entity	71
Number of International joint venture properties	13
Number of joint venture properties managed by others	16
Simon Property Group, Inc.
Weighted average ownership interest (as a percent)	85.60%	83.10%
Percentage of ownership interest held by the parent company (as a percent)	85.60%		85.60%

Significant Accounting Policies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Marketable and Non-Marketable Securities
Net unrealized gains recorded in accumulated other comprehensive income (loss)	$ 1.8	$ 2.6
Value of non-marketable security accounted for under the cost method	118.7	98.9
Other-than-temporary non-cash charges	0.0
Held-to-maturity securities
Marketable and Non-Marketable Securities
Investments used to fund debt service requirements	$ 16.8	$ 24.9
Available for sale securities \| Securities in captive insurance subsidiary portfolio \| Minimum
Marketable and Non-Marketable Securities
Investment maturity period	1 year
Available for sale securities \| Securities in captive insurance subsidiary portfolio \| Maximum
Marketable and Non-Marketable Securities
Investment maturity period	10 years

Significant Accounting Policies (Details 2) $ in Millions	6 Months Ended	12 Months Ended
Significant Accounting Policies (Details 2) $ in Millions	Jun. 30, 2012 USD ($)	Dec. 31, 2012 item
Loans Held for Investment
Number of mortgage and mezzanine loans secured by real estate repaid during the year \| item		3
Interest income on loans held for investment \| $	$ 5.0

Significant Accounting Policies (Details 3) - Recurring - USD ($) $ in Millions	Jun. 30, 2013	Dec. 31, 2012
Level 1
Fair Value Measurement:
Marketable securities with Level 1 fair value inputs	$ 125.1	$ 170.2
Level 2
Fair Value Measurement:
Interest rate swap agreements and foreign currency forward contracts, gross liability balance	1.0	1.5
Interest rate swap agreements and foreign currency forward contracts, gross asset balance	4.3	$ 3.0
Level 3
Fair Value Measurement:
Investments	$ 0.0

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References + Details

Significant Accounting Policies (Details 4) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Noncontrolling Interests:
Balance			$ 6,893,089
Balance	$ 6,806,247		6,806,247
Noncontrolling Interests
Noncontrolling Interests:
Balance	(931)	$ (619)	(877)	$ (59,000)
Net Income (loss) attributable to noncontrolling nonredeemable interests	23	(15)	26	(2)
Distributions to noncontrolling nonredeemable interestholders	(119)		(178)	(191)
Purchase of noncontrolling interests and other	(2)			58,559
Balance	(1,029)	$ (634)	(1,029)	$ (634)
Noncontrolling interests redeemable at amounts in excess of fair value	$ 0		$ 0
7.5% Cumulative Redeemable Preferred Units \| Noncontrolling Interests
Noncontrolling Interests:
Dividend rate on cumulative redeemable preferred units (as a percent)			7.50%

- Definition

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References + Details

Significant Accounting Policies (Details 5) $ in Thousands	6 Months Ended
Significant Accounting Policies (Details 5) $ in Thousands	Jun. 30, 2013 USD ($)
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	$ (106,146)
Other comprehensive income (loss) before reclassifications	(17,452)
Amounts reclassified from accumulated other comprehensive income (loss)	4,076
Net current-period other comprehensive income (loss)	(13,376)
Ending balance	(119,522)
Currency translation adjustments
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	(30,620)
Other comprehensive income (loss) before reclassifications	(21,912)
Net current-period other comprehensive income (loss)	(21,912)
Ending balance	(52,532)
Accumulated derivative losses, net
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	(78,139)
Other comprehensive income (loss) before reclassifications	5,275
Amounts reclassified from accumulated other comprehensive income (loss)	4,076
Net current-period other comprehensive income (loss)	9,351
Ending balance	(68,788)
Net unrealized gains on marketable securities
Changes in accumulated other comprehensive income (loss) by component
Beginning balance	2,613
Other comprehensive income (loss) before reclassifications	(815)
Net current-period other comprehensive income (loss)	(815)
Ending balance	$ 1,798

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 31
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

- Definition

Net of tax amount of other comprehensive income (loss) attributable to the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569643-111683

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Significant Accounting Policies (Details 6) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Significant Accounting Policies
Interest expense	$ (279,966)	$ (288,560)	$ (564,991)	$ (546,636)
NET INCOME ATTRIBUTABLE TO UNITHOLDERS	$ 397,115	$ 257,768	727,809	$ 1,036,175
Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
NET INCOME ATTRIBUTABLE TO UNITHOLDERS			(4,076)
Accumulated derivative losses, net \| Amount reclassified from accumulated other comprehensive income (loss)
Significant Accounting Policies
Interest expense			$ (4,076)

Significant Accounting Policies (Details 7) $ in Millions, ¥ in Billions	Jun. 30, 2013 USD ($) instrument	Jun. 30, 2013 JPY (¥) instrument	Dec. 31, 2012 USD ($)
Derivative financial instruments
Gross accumulated other comprehensive income or loss related to derivative activities	$ 68.8		$ 78.1
Interest rate swap
Derivative financial instruments
Number of Instruments \| instrument	1	1
Notional Amount	$ 92.7
Interest rate net derivative liability, fair value	$ 1.0		$ 1.5
Interest rate cap
Derivative financial instruments
Number of Instruments \| instrument	6	6
Notional Amount	$ 440.4
USD-Yen currency forward contract
Derivative financial instruments
Notional amount, foreign currency derivatives (in Japanese Yen) \| ¥		¥ 1.7
Asset value of forwards included in deferred costs and other assets	$ 4.3

Per Unit Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Per Unit Data (Details) - USD ($) $ in Thousands	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Per Unit Data
Net Income attributable to Unitholders - Basic	$ 397,115	$ 257,768	$ 727,809	$ 1,036,175
Net Income attributable to Unitholders - Diluted	$ 397,115	$ 257,768	$ 727,809	$ 1,036,175
Weighted Average Units Outstanding - Basic (in shares)	362,455,413	364,300,150	362,254,663	360,463,043
Effect of stock options of Simon Property (in shares)		1,042	103	1,079
Weighted Average Units Outstanding - Diluted (in shares)	362,455,413	364,301,192	362,254,766	360,464,122

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Investment in Unconsolidated Entities (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 22, 2012 USD ($) property	Jan. 31, 2013 USD ($)	Jan. 31, 2012 USD ($)	Jun. 30, 2013 USD ($) property $ / shares shares	Jun. 30, 2012 USD ($)	Jun. 30, 2013 USD ($) property $ / shares shares	Jun. 30, 2012 USD ($)	Dec. 31, 2012 USD ($) property	Dec. 30, 2012	May 21, 2012	Mar. 14, 2012 USD ($)	Jan. 09, 2012 USD ($) property	Jan. 06, 2012 USD ($)
Real Estate Joint Ventures and Investments
Share of net income, net of amortization of our excess investment				$ 56,516	$ 29,132	$ 110,747	$ 59,484
Investment in unconsolidated entities, at equity				$ 1,958,503		$ 1,958,503		$ 2,108,966
McArthurGlen Group
Real Estate Joint Ventures and Investments
Ownership interest (as a percent)				50.00%		50.00%
Investment in unconsolidated entities, at equity				$ 38,700		$ 38,700
GCI
Real Estate Joint Ventures and Investments
Proceeds from sale of interest in joint venture			$ 375,800
Gain (loss) upon acquisition of controlling interest, and on sale or disposal of assets and interests in unconsolidated entities, net			$ 28,800
Accumulated losses reclassified												$ 39,500
Shops at Mission Viejo
Real Estate Joint Ventures and Investments
Joint venture ownership percentage				51.00%		51.00%
Ownership interest (as a percent)									100.00%
Aggregate face amount of mortgage notes		$ 295,000
Weighted average interest rates on mortgage notes (as a percent)		3.61%
Amount of distribution received from proceeds of financing in joint venture		$ 149,700
Shops at Mission Viejo \| IMI
Real Estate Joint Ventures and Investments
Joint venture ownership percentage				49.00%		49.00%
Woodfield Mall
Real Estate Joint Ventures and Investments
Joint venture ownership percentage				50.00%		50.00%
Aggregate face amount of mortgage notes				$ 425,000		$ 425,000
Weighted average interest rates on mortgage notes (as a percent)						4.50%
Woodfield Mall \| IMI
Real Estate Joint Ventures and Investments
Joint venture ownership percentage				50.00%		50.00%
Ownership interest (as a percent)									100.00%
Value Retail PLC
Real Estate Joint Ventures and Investments
Number of income-producing properties \| property				3		3
Carrying value of investments under the cost method				$ 115,300		$ 115,300		95,500
Klepierre
Real Estate Joint Ventures and Investments
Interest in income-producing properties, under joint venture arrangements (as a percent)											28.70%
Ownership interest (as a percent)				28.90%		28.90%				28.90%
Cost of acquisition including assumption of debt											$ 2,000,000
Number of shares owned in acquired entity \| shares				57,634,148		57,634,148
Quoted market price of shares owned in acquired entity (in dollars per share) \| $ / shares				$ 39.47		$ 39.47
Excess investment in acquisition of joint venture											$ 1,200,000
Share of net income, net of amortization of our excess investment						$ 23,300
Total revenues of Klepierre						725,600
Operating income of Klepierre						282,900
Consolidated net income (loss) of Klepierre						$ 97,900
Del Amo Fashion Center
Real Estate Joint Ventures and Investments
Ownership interest (as a percent)													50.00%
Purchase price of business acquired													$ 50,000
The Mills acquisition
Real Estate Joint Ventures and Investments
Number of income-producing properties acquired \| property	9
The Mills acquisition \| SPG-FCM
Real Estate Joint Ventures and Investments
Number of properties in which additional interest is acquired \| property	26
Number of remaining unconsolidated properties \| property	16
Cost of acquisition including assumption of debt	$ 1,500,000
Debt obligation related to consolidated properties disposed of	562,100
Trust preferred securities retired	100,000
Related party debt obligations extinguished during the period	558,400
Mortgage indebtedness assumed	$ 2,600,000
Gain due to acquisition of controlling interest								488,700
Other than temporary impairment charge								$ 22,400
United States joint ventures
Real Estate Joint Ventures and Investments
Number of income-producing properties \| property				74		74		78
Japan joint ventures
Real Estate Joint Ventures and Investments
Number of income-producing properties \| property				9		9		8
Ownership interest (as a percent)				40.00%		40.00%
Investment in unconsolidated entities, at equity				$ 275,000		$ 275,000		$ 314,200
Mexico joint venture
Real Estate Joint Ventures and Investments
Number of income-producing properties \| property				1		1		1
South Korea joint ventures
Real Estate Joint Ventures and Investments
Number of income-producing properties \| property				2		2		2
Ownership interest (as a percent)				50.00%		50.00%
Investment in unconsolidated entities, at equity				$ 67,100		$ 67,100		$ 62,900
Malaysia joint venture
Real Estate Joint Ventures and Investments
Number of income-producing properties \| property				1		1		1
Italy
Real Estate Joint Ventures and Investments
Number of income-producing properties \| property												45
Canada \| McArthurGlen Group
Real Estate Joint Ventures and Investments
Ownership interest (as a percent)				45.00%		45.00%
Number of development projects \| property				1		1
Europe
Real Estate Joint Ventures and Investments
Interest in income-producing properties, under joint venture arrangements (as a percent)				28.90%		28.90%
Europe \| Value Retail PLC
Real Estate Joint Ventures and Investments
Number of luxury outlets owned and operated \| property				9		9

Investment in Unconsolidated Entities (Details 2) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2013 USD ($) property	Jun. 30, 2012 USD ($)	Dec. 31, 2012 USD ($) property	Mar. 22, 2012 property	Dec. 31, 2011 USD ($)
Assets:
Investment properties, at cost	$ 34,636,100		$ 34,636,100		$ 34,252,521
Less - accumulated depreciation	9,544,943		9,544,943		9,068,388
Investment properties at cost, net	25,091,157		25,091,157		25,184,133
Cash and cash equivalents	1,095,829	$ 638,499	1,095,829	$ 638,499	1,184,518		$ 798,650
Tenant receivables and accrued revenue, net	491,388		491,388		521,301
Investment in unconsolidated entities, at equity	1,958,503		1,958,503		2,108,966
Deferred costs and other assets	1,474,421		1,474,421		1,570,734
Total assets	32,015,137		32,015,137		32,586,606
Liabilities and Partners' Deficit:
Mortgages and unsecured indebtedness	22,687,622		22,687,622		23,113,007
Accounts payable, accrued expenses, intangibles, and deferred revenue	1,273,211		1,273,211		1,374,172
Other liabilities	231,774		231,774		303,588
Total liabilities	25,028,872		25,028,872		25,515,511
Preferred units	44,554		44,554		44,719
Total liabilities and equity	32,015,137		32,015,137		$ 32,586,606
Revenue:
Minimum rent	778,159	746,198	1,556,066	1,448,295
Overage rent	40,248	31,427	77,947	59,107
Tenant reimbursements	353,163	330,470	692,132	636,857
Other income	33,179	51,624	63,933	102,142
Total revenue	1,236,563	1,188,066	2,451,621	2,307,035
Operating Expenses:
Property operating	117,479	116,018	227,388	220,758
Depreciation and amortization	318,638	311,863	635,272	596,972
Real estate taxes	109,409	106,777	219,114	205,479
Repairs and maintenance	27,107	26,665	56,832	52,307
Advertising and promotion	29,360	28,549	50,619	49,648
Provision for (Recovery of) credit losses	(1,301)	2,906	1,433	6,451
Other	18,604	21,124	36,605	37,788
Total operating expenses	671,673	663,739	1,329,043	1,265,987
Operating Income	564,890	524,327	1,122,578	1,041,048
Interest expense	(279,966)	(288,560)	$ (564,991)	(546,636)
Malls
Schedule of Equity Method Investments
Number of properties disposed \| property					1
Retail property
Schedule of Equity Method Investments
Number of properties disposed \| property			1		3
The Mills acquisition
Schedule of Equity Method Investments
Number of income-producing properties acquired \| property						9
Equity Method Investments
Assets:
Investment properties, at cost	14,621,714		$ 14,621,714		$ 14,607,291
Less - accumulated depreciation	5,027,179		5,027,179		4,926,511
Investment properties at cost, net	9,594,535		9,594,535		9,680,780
Cash and cash equivalents	551,059		551,059		619,546
Tenant receivables and accrued revenue, net	225,178		225,178		252,774
Investment in unconsolidated entities, at equity	38,958		38,958		39,589
Deferred costs and other assets	707,343		707,343		438,399
Total assets	11,117,073		11,117,073		11,031,088
Liabilities and Partners' Deficit:
Mortgages and unsecured indebtedness	11,964,864		11,964,864		11,584,863
Accounts payable, accrued expenses, intangibles, and deferred revenue	596,283		596,283		672,483
Other liabilities	657,205		657,205		447,132
Total liabilities	13,218,352		13,218,352		12,704,478
Preferred units	67,450		67,450		67,450
Partners' deficit	(2,168,729)		(2,168,729)		(1,740,840)
Total liabilities and equity	11,117,073		11,117,073		11,031,088
Our Share of:
Partners' deficit	(992,395)		(992,395)		(799,911)
Add: Excess Investment	2,114,633		2,114,633		2,184,133
Our net Investment in Unconsolidated Entities, at equity	1,122,238		1,122,238		$ 1,384,222
Revenue:
Minimum rent	399,391	363,541	793,544	721,517
Overage rent	40,014	36,064	87,781	84,620
Tenant reimbursements	187,151	165,623	371,550	332,153
Other income	39,528	36,597	81,602	86,934
Total revenue	666,084	601,825	1,334,477	1,225,224
Operating Expenses:
Property operating	123,296	111,967	239,165	226,801
Depreciation and amortization	126,701	122,475	254,386	249,453
Real estate taxes	50,072	42,450	104,778	87,550
Repairs and maintenance	16,339	15,427	32,503	29,851
Advertising and promotion	14,103	12,688	30,023	27,895
Provision for (Recovery of) credit losses	336	(793)	1,580	399
Other	36,496	38,549	72,181	92,043
Total operating expenses	367,343	342,763	734,616	713,992
Operating Income	298,741	259,062	599,861	511,232
Interest expense	(154,508)	(148,980)	(301,994)	(302,690)
Income from Continuing Operations	144,233	110,082	297,867	208,542
Loss from operations of discontinued joint venture interests	(26)	(5,280)	(346)	(18,791)
Gain on disposal of discontinued operations, net	18,356		18,356
Net Income	162,563	104,802	315,877	189,751
Third-Party Investors' Share of Net Income	94,949	56,787	178,715	96,800
Our Share of Net Income	67,614	48,015	137,162	92,951
Amortization of Excess Investment	(24,853)	(18,749)	(49,682)	(33,333)
Income from Unconsolidated Entities	$ 42,761	$ 29,266	$ 87,480	$ 59,618
Equity Method Investments \| Maximum
Our Share of:
Life of joint ventures with excess investment			40 years

Debt (Details) $ in Thousands	6 Months Ended	12 Months Ended
Debt (Details) $ in Thousands	Jun. 30, 2013 USD ($) item property note mortgagepool	Dec. 31, 2012 USD ($)	May 16, 2013
Debt
Total Mortgages and Other Indebtedness	$ 22,687,622	$ 23,113,007
Fair value of debt
Carrying value of fixed-rate mortgages and unsecured indebtedness	20,900,000	21,000,000
Fair value of fixed-rate mortgages and unsecured indebtedness	$ 22,396,000	$ 23,373,000
Weighted average discount rates assumed in calculation of fair value for fixed-rate mortgages (as a percent)	3.68%	3.24%
Mortgages
Debt
Amount of debt redeemed	$ 240,000
Unsecured Debt \| Senior unsecured notes
Debt
Total Mortgages and Other Indebtedness	13,000,000
Unsecured Debt \| Senior unsecured notes 5.30% to 6.00%
Debt
Amount of debt redeemed	$ 429,500
Interest rate, low end of range (as a percent)	5.30%
Interest rate, high end of range (as a percent)	6.00%
Unsecured Debt \| Credit Facility and the Supplemental Facility
Debt
Available borrowing capacity	$ 4,600,000
Number of credit facilities \| item	2
Maximum amount outstanding during period	$ 1,600,000
Credit facility, weighted average amount outstanding	1,500,000
Letters of credit outstanding	45,100
Unsecured Debt \| Credit Facility
Debt
Credit facility, amount outstanding	1,200,000
Maximum borrowing capacity	4,000,000
Optional expanded maximum borrowing capacity	$ 5,000,000
Reference rate	LIBOR
Interest added to reference rate (as a percent)	0.95%
Additional facility fee (as a percent)	0.15%
Reduction in interest added to reference rate (as a percent)			0.05%
Multi-currency tranche	$ 2,000,000
Unsecured Debt \| Supplemental Facility
Debt
Credit facility, amount outstanding	226,100
Maximum borrowing capacity	2,000,000
Optional expanded maximum borrowing capacity	$ 2,500,000
Reference rate	LIBOR
Interest added to reference rate (as a percent)	0.95%
Additional facility fee (as a percent)	0.15%
Reduction in interest added to reference rate (as a percent)			0.05%
Unsecured Debt \| Term loan
Debt
Total Mortgages and Other Indebtedness	$ 240,000
Maximum borrowing capacity	$ 300,000
Reference rate	LIBOR
Interest added to reference rate (as a percent)	1.10%
Number of one-year extension options available \| item	2
Debt instrument extension period	1 year
Mortgage Debt
Debt
Total Mortgages and Other Indebtedness	$ 8,000,000	$ 8,000,000
Number of non-recourse mortgage notes under which the Company and subsidiaries are borrowers \| note	79
Number of properties secured by non-recourse mortgage notes \| property	79
Number of cross-defaulted and cross-collateralized mortgage pools \| mortgagepool	7
Total number of properties pledged as collateral for cross defaulted and cross collateralized mortgages \| property	27

Equity (Details) $ / shares in Units, $ in Millions					1 Months Ended	3 Months Ended			6 Months Ended
Equity (Details) $ / shares in Units, $ in Millions	Jun. 06, 2013 $ / shares	May 14, 2013 $ / shares shares	Apr. 02, 2013 $ / shares	Feb. 25, 2013 $ / shares	Jul. 31, 2011 USD ($) shares	Mar. 31, 2013 item shares	Mar. 31, 2012 item shares	Mar. 31, 2011 item shares	Jun. 30, 2013 USD ($) partner shares	Jun. 30, 2012 USD ($)	Mar. 16, 2010 item
Equity
Compensation expense, net of capitalization									$ 27.1	$ 23.4
LTIP Retention Award to Chairman and CEO
Equity
Restricted stock awards granted (in shares) \| shares					1,000,000
Aggregate grant date fair value					$ 120.3
Vesting rights (as a percent)					33.00%
Service period					8 years
LTIP programs
Equity
Number of programs approved \| item											3
Percent of distributions that participants are entitled to receive during performance period									10.00%
One-year 2010 LTIP Program
Equity
Post performance period service based vesting period									2 years
Performance period									1 year
Restricted stock awards granted (in shares) \| shares								133,673
Vesting period (in installments) \| item								2
Aggregate grant date fair value									$ 7.2
Two-year 2010 LTIP Program
Equity
Post performance period service based vesting period									2 years
Performance period									2 years
Vesting period (in installments) \| item							2
Units earned under LTIP program (in shares) \| shares							337,006
Aggregate grant date fair value									$ 14.8
Three-year 2010 LTIP Program
Equity
Post performance period service based vesting period									2 years
Performance period									3 years
Vesting period (in installments) \| item						2
Units earned under LTIP program (in shares) \| shares						489,654
Aggregate grant date fair value									$ 23.0
2011-2013 LTIP Program
Equity
Performance period									3 years
Aggregate grant date fair value									$ 35.0
2012-2014 LTIP Program
Equity
Performance period									3 years
Vesting rights (as a percent)									50.00%
Aggregate grant date fair value									$ 35.0
2013-2015 LTIP program
Equity
Performance period									3 years
Vesting rights (as a percent)									50.00%
Aggregate grant date fair value									$ 33.5
Simon Property
Equity
Number of limited partners who received common stock \| partner									10
The number of common stock shares issued in exchange for partnership units \| shares									318,162
Simon Property \| Restricted stock issued under 1998 Stock Incentive Plan \| Employees
Equity
Restricted stock awards granted (in shares) \| shares									107,528
Weighted average fair value of shares granted during the year (in dollars per share) \| $ / shares	$ 166.56		$ 159.32	$ 157.37
Vesting period									3 years
Simon Property \| Restricted stock issued under 1998 Stock Incentive Plan \| Non-employee Directors
Equity
Restricted stock awards granted (in shares) \| shares		3,487
Weighted average fair value of shares granted during the year (in dollars per share) \| $ / shares		$ 179.23
Vesting period									1 year

Equity (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Equity (Details 2) - USD ($) $ in Thousands	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Increase (Decrease) in Stockholders' Equity
Balance			$ 6,893,089
Other			31,998
Distributions to limited partners, excluding preferred interests classified as temporary equity			(834,968)
Comprehensive income, excluding $957 attributable to preferred distributions on temporary equity preferred units and $4,532 attributable to noncontrolling redeemable interests in properties in temporary equity			716,128
Balance	$ 6,806,247		6,806,247
Comprehensive income attributable to noncontrolling interests	2,097	$ 1,855	4,558	$ 3,964
Preferred Units
Increase (Decrease) in Stockholders' Equity
Balance			44,719
Other			(165)
Distributions to limited partners, excluding preferred interests classified as temporary equity			(1,669)
Comprehensive income, excluding $957 attributable to preferred distributions on temporary equity preferred units and $4,532 attributable to noncontrolling redeemable interests in properties in temporary equity			1,669
Balance	44,554		44,554
Comprehensive income, attributable to preferred distributions on temporary equity preferred units			957
Simon Property (Managing General Partner)
Increase (Decrease) in Stockholders' Equity
Balance			5,865,884
Limited partner units exchanged to units			5,982
Other			9,632
Adjustment to limited partners' interest from increased ownership in the Operating Partnership			10,442
Distributions to limited partners, excluding preferred interests classified as temporary equity			(713,392)
Comprehensive income, excluding $957 attributable to preferred distributions on temporary equity preferred units and $4,532 attributable to noncontrolling redeemable interests in properties in temporary equity			611,647
Balance	5,790,195		5,790,195
Limited Partners
Increase (Decrease) in Stockholders' Equity
Balance			983,363
Limited partner units exchanged to units			(5,982)
Other			22,531
Adjustment to limited partners' interest from increased ownership in the Operating Partnership			(10,442)
Distributions to limited partners, excluding preferred interests classified as temporary equity			(119,729)
Comprehensive income, excluding $957 attributable to preferred distributions on temporary equity preferred units and $4,532 attributable to noncontrolling redeemable interests in properties in temporary equity			102,786
Balance	972,527		972,527
Noncontrolling interests
Increase (Decrease) in Stockholders' Equity
Balance	(931)	(619)	(877)	(59,000)
Distributions to limited partners, excluding preferred interests classified as temporary equity			(178)
Comprehensive income, excluding $957 attributable to preferred distributions on temporary equity preferred units and $4,532 attributable to noncontrolling redeemable interests in properties in temporary equity			26
Balance	$ (1,029)	$ (634)	(1,029)	$ (634)
Comprehensive income attributable to noncontrolling interests			$ 4,532

Commitments and Contingencies (Details) - USD ($) $ in Millions	1 Months Ended
	May 31, 2010	Jun. 30, 2013	Dec. 31, 2012
Commitments and Contingencies
Insurance proceeds funded by insurers	$ 50.0
Minimum insurance coverage	50.0
Additional insurance proceeds	$ 150.0
Joint venture mortgage and indebtedness
Guarantees of Joint Venture Indebtedness:
Loan guarantee		$ 142.7	$ 84.9
Loan guarantees recoverable		$ 66.1	$ 38.6

Commitments and Contingencies (Details 2)	6 Months Ended
Commitments and Contingencies (Details 2)	Jun. 30, 2013
Consolidated revenues \| Concentration of credit risk \| Maximum
Concentration of Credit Risk
Percentage of consolidated revenues from a single customer or tenant	5.00%

Real Estate Acquisitions and Dispositions (Details) $ in Thousands				3 Months Ended	6 Months Ended		12 Months Ended
	May 30, 2013 USD ($) ft²	Dec. 04, 2012 USD ($) property	May 03, 2012 USD ($) property	Jun. 30, 2013 USD ($) property	Jun. 30, 2013 USD ($) property	Jun. 30, 2012 USD ($)	Dec. 31, 2012 USD ($) property	Jun. 04, 2012 USD ($) ft²	May 21, 2012	Mar. 22, 2012 USD ($) property	Mar. 14, 2012 USD ($)	Jan. 06, 2012 USD ($)
Real Estate Acquisitions and Dispositions
Gain (loss) upon acquisition of controlling interests, and on sale or disposal of assets and interests in unconsolidated entities, net				$ 68,068	$ 88,835	$ 494,837
Consolidated retail properties
Real Estate Acquisitions and Dispositions
Number of properties disposed \| property					2		9
Unconsolidated retail properties
Real Estate Acquisitions and Dispositions
Number of properties disposed \| property					1		4
Consolidated and Unconsolidated Retail Properties
Real Estate Acquisitions and Dispositions
Gain (loss) upon acquisition of controlling interests, and on sale or disposal of assets and interests in unconsolidated entities, net					$ 61,500		$ 15,500
Domain, The, Austin, TX
Real Estate Acquisitions and Dispositions
Number of properties disposed \| property			2
Gain (loss) upon acquisition of controlling interests, and on sale or disposal of assets and interests in unconsolidated entities, net			$ 12,400
The Mills acquisition \| SPG-FCM
Real Estate Acquisitions and Dispositions
Number of properties in which additional interest is acquired \| property										26
Cost of acquisition including assumption of debt										$ 1,500,000
Klepierre
Real Estate Acquisitions and Dispositions
Ownership interests acquired (as a percent)											28.70%
Cost of acquisition including assumption of debt											$ 2,000,000
Ownership interest (as a percent)				28.90%	28.90%				28.90%
Del Amo Fashion Center
Real Estate Acquisitions and Dispositions
Purchase price of business acquired												$ 50,000
Ownership interest (as a percent)												50.00%
Outlet Centers \| Destin, Florida
Real Estate Acquisitions and Dispositions
Ownership interests acquired (as a percent)								50.00%
Area of lifestyle center acquired (in square feet) \| ft²								465,000
Cost of acquisition including assumption of debt								$ 70,500
Outlet Centers \| Portland, Oregon
Real Estate Acquisitions and Dispositions
Gain (loss) upon acquisition of controlling interests, and on sale or disposal of assets and interests in unconsolidated entities, net	$ 27,300
Ownership interests acquired (as a percent)	100.00%
Area of lifestyle center acquired (in square feet) \| ft²	390,000
Aggregate cash purchase price for acquisition	$ 146,700
Grand Prairie, Texas and Livermore California outlets
Real Estate Acquisitions and Dispositions
Number of properties in which additional interest is acquired \| property		2
Ownership interests acquired (as a percent)		50.00%
Acquisition, consideration paid		$ 260,900
Percentage of consideration paid in cash		90.00%
Percentage of consideration paid in units		10.00%
Extinguishment of construction loans		$ 162,500
Ownership interest (as a percent)				100.00%	100.00%
Community/Lifestyle Centers
Real Estate Acquisitions and Dispositions
Number of properties in which additional interest is acquired \| property				3	3
Number of properties disposed \| property					3