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

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FORM 10-K

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

For the fiscal year ended December 31, 2009

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

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

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

Securities registered pursuant to Section 12(b) of the Act:

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

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

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

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

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

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

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

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

            The aggregate market value of shares of common stock held by non-affiliates of the Registrant was approximately $14,157 million based on the closing sale price on the New York Stock Exchange for such stock on June 30, 2009.

            As of January 31, 2010, Simon Property Group, Inc. had 289,976,654 and 8,000 shares of common stock and Class B common stock outstanding, respectively.

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Documents Incorporated By Reference

            Portions of the Registrant's Annual Report to Stockholders are incorporated by reference into Parts I, II and IV; and portions of the Registrant's Proxy Statement in connection with its 2010 Annual Meeting of Stockholders are incorporated by reference in Part III.

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Simon Property Group, Inc. and Subsidiaries
Annual Report on Form 10-K
December 31, 2009

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Part I

Item 1. Business

            Simon Property Group, Inc. is a Delaware corporation that operates as a self-administered and self-managed real estate investment trust, or REIT, under the Internal Revenue Code. Simon Property Group, L.P., or the Operating Partnership, is our majority-owned partnership subsidiary that owns all of our real estate properties. In this report, the terms "we", "us" and "our" refer to Simon Property Group, Inc. and its subsidiaries.

            We own, develop and manage retail real estate properties, which consist primarily of regional malls, Premium Outlet® Centers, The Mills®, and community/lifestyle centers. As of December 31, 2009, we owned or held an interest in 321 income-producing properties in the United States, which consisted of 162 regional malls, 41 Premium Outlet Centers, 67 community/lifestyle centers, 36 properties acquired in the 2007 acquisition of The Mills Corporation, or the Mills acquisition, and 15 other shopping centers or outlet centers in 41 states and Puerto Rico. Of the 36 properties acquired in The Mills portfolio, 16 of these properties are The Mills, 16 are regional malls, and four are community centers. We also own an interest in one parcel of land held in the United States for future development. Internationally, as of December 31, 2009, we had ownership interests in 51 European shopping centers (France, Italy and Poland), eight Premium Outlet Centers in Japan, one Premium Outlet Center in Mexico, and one Premium Outlet Center in South Korea. Also, through joint venture arrangements we have a 24% interest in two shopping centers in Italy currently under development. On February 4, 2010, we and our partner entered into a definitive agreement to sell all of the interests in Simon Ivanhoe S.à.r.l, or Simon Ivanhoe, which owns seven shopping centers located in France and Poland.

            For a description of our operational strategies and developments in our business during 2009, see the "Management's Discussion and Analysis of Financial Condition and Results of Operations" section of the 2009 Annual Report to Shareholders filed as Exhibit 13.1 to this Form 10-K.

Other Policies

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

Investment Policies

            While we emphasize equity real estate investments, we may, at our discretion, invest in mortgages and other real estate interests consistent with our qualification as a REIT. We do not currently intend to invest to a significant extent in mortgages or deeds of trust; however, we hold a mortgage note which results in us receiving 100% of the economics of a property. We may invest in participating or convertible mortgages if we conclude that we may benefit from the cash flow or any appreciation in the value of the property.

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

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

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Financing Policies

            We must comply with the covenants contained in our financing agreements that limit our ratio of debt to total assets or market value, as defined. For example, the Operating Partnership's lines of credit and the indentures for the Operating Partnership's debt securities contain covenants that restrict the total amount of debt of the Operating Partnership to 65%, or 60% in relation to certain debt, of total assets, as defined under the related arrangement, and secured debt to 50% of total assets. In addition, these agreements contain other covenants requiring compliance with financial ratios. Furthermore, the amount of debt that we may incur is limited as a practical matter by our desire to maintain acceptable ratings for our equity securities and the debt securities of the Operating Partnership.

            If our Board of Directors determines to seek additional capital, we may raise such capital through additional equity offerings, debt financing, creating joint ventures with existing ownership interests in properties, retention of cash flows or a combination of these methods. Our ability to retain cash flows is limited by the requirement for REITs to distribute at least 90% of their taxable income. We must also take into account taxes that would be imposed on undistributed taxable income. If the Board of Directors determines to raise additional equity capital, it may, without stockholder approval, issue additional shares of common stock or other capital stock. The Board of Directors may issue a number of shares up to the amount of our authorized capital in any manner and on such terms and for such consideration as it deems appropriate. Such securities may be senior to the outstanding classes of common stock. Such securities also may include additional classes of preferred stock, which may be convertible into common stock. Existing stockholders have no preemptive right to purchase shares in any subsequent offering of our securities. Any such offering could dilute a stockholder's investment in us.

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

            On December 8, 2009, the Operating Partnership entered into a new $3.565 billion unsecured revolving corporate credit facility which replaced its $3.5 billion unsecured credit facility, or the Credit Facility, which expired on January 11, 2010. The new credit facility contains an accordion feature allowing the maximum borrowing capacity to expand to $4.0 billion. The new credit facility matures on March 31, 2013. We issue debt securities through the Operating Partnership, but we may issue our debt securities which may be convertible into capital stock or be accompanied by warrants to purchase capital stock. We also may sell or securitize our lease receivables. The proceeds from any borrowings or financings may be used for one or more of the following:

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financing acquisitions;

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developing or redeveloping properties;

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refinancing existing indebtedness;

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working capital or capital improvements; or

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meeting the income distribution requirements applicable to REITs, if we have income without the receipt of cash sufficient to enable us to meet such distribution requirements.

            We may also finance acquisitions through the following:

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issuance of shares of common stock or preferred stock;

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issuance of additional units of limited partnership interest in the Operating Partnership;

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issuance of preferred units of the Operating Partnership;

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issuance of other securities; or

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sale or exchange of ownership interests in properties.

            The ability of the Operating Partnership to issue units of limited partnership interest to transferors of properties or other partnership interests may defer gain recognition for tax purposes by the transferor. It may also be advantageous for us since there are ownership limits that restrict the number of shares of our capital stock that investors may own.

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

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

Conflict of Interest Policies

            We maintain policies and have entered into agreements designed to reduce or eliminate potential conflicts of interest. We have adopted governance principles governing our affairs and the Board of Directors, as well as written charters for each of the standing Committees of the Board of Directors. In addition, we have a Code of Business Conduct and Ethics, which applies to all of our officers, directors, and employees. At least a majority of the members of our Board of Directors must qualify as independent under the listing standards for New York Stock Exchange companies and cannot be affiliated with the Simon family who are significant stockholders and/or unitholders in the Operating Partnership. Any transaction between us and the Simons, including property acquisitions, service and property management agreements and retail space leases, must be approved by a majority of our non-affiliated directors.

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

Policies With Respect To Certain Other Activities

            We intend to make investments which are consistent with our qualification as a REIT, unless the Board of Directors determines that it is no longer in our best interests to so qualify as a REIT. The Board of Directors may make such a determination because of changing circumstances or changes in the REIT requirements. We have authority to offer shares of our capital stock or other securities in exchange for property. We also have authority to repurchase or otherwise reacquire our shares or any other securities. We may issue shares of our common stock, or cash at our option, to holders of units of limited partnership interest in the Operating Partnership in future periods upon exercise of such holders' rights under the Operating Partnership agreement. Our policy prohibits us from making any loans to our directors or executive officers for any purpose. We may make loans to the joint ventures in which we participate.

Competition

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

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land for development and operating properties). We believe that there are numerous factors that make our properties highly desirable to retailers including:

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the quality and diversity of our properties;

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our management and operational expertise;

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our extensive experience and relationships with retailers and lenders;

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our mall marketing initiatives and consumer focused strategic corporate alliances; and

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our ability to reduce the total occupancy cost of our tenants.

Certain Activities

            During the past three years, we have:

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issued 6,133,556 shares of common stock upon the exchange of units of limited partnership interest of the Operating Partnership, or units;

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issued 753,824 restricted shares of common stock, net of forfeitures, under The Simon Property Group 1998 Stock Incentive Plan, or the 1998 Plan;

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issued 694,981 shares of common stock upon exercise of stock options under the 1998 Plan;

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purchased 595,000 shares of common stock;

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issued 5,203,763 shares of common stock upon the conversion of 6,502,979 shares of Series I 6% Convertible Perpetual Preferred Stock, or Series I preferred stock;

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issued 11,876,076 shares of common stock as part of the quarterly dividends to common stockholders;

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issued 23,000,000 shares of common stock in a public offering at a public offering price of $50.00 per share;

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issued 17,250,000 shares of common stock in a public offering at a public offering price of $31.50 per share;

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redeemed all of the outstanding 3,000,000 shares of Series G preferred stock;

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issued 812,381 shares of Series I preferred stock upon the exchange of Series I 6% Convertible Perpetual Preferred Units;

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issued 4,000 shares of common stock upon conversion and retirement of all 4,000 shares of Class C common stock;

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borrowed a maximum amount of $2.6 billion under the prior Credit Facility; the outstanding amount of borrowings under this facility as of December 31, 2009 was $446.1 million, all related to the U.S. dollar equivalent of Euro and Yen-denominated borrowings;

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entered into our new $3.565 billion credit facility on December 8, 2009;

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provided annual reports containing financial statements certified by our independent registered public accounting firm and quarterly reports containing unaudited financial statements to our security holders;

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

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

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not underwritten securities of other issuers; and

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

Employees

            At January 5, 2010, we and our affiliates employed approximately 5,200 persons at various properties and offices throughout the United States, of which approximately 1,900 were part-time. Approximately 1,000 of these employees were located at our corporate headquarters in Indianapolis, Indiana and 100 were located at our Chelsea offices in Roseland, New Jersey.

Corporate Headquarters

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

Available Information

            We are a large accelerated filer (as defined in Rule 12b-2 of the Securities Exchange Act of 1934, as amended, or Exchange Act) and are required, pursuant to Item 101 of Regulation S-K, to provide certain information regarding

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

            The following corporate governance documents are also available through the "About Simon/Investor Relations/Corporate Governance" section of our Internet website or may be obtained in print form by request of our Investor Relations Department: Governance Principles, Code of Business Conduct and Ethics, Audit Committee Charter, Compensation Committee Charter, Governance and Nominating Committee Charter, and Executive Committee Charter.

            In addition, we intend to disclose on our Internet website any amendments to, or waivers from, our Code of Business Conduct and Ethics that are required to be publicly disclosed pursuant to rules of the SEC and the New York Stock Exchange, or NYSE.

Executive Officers of the Registrant

            The following table sets forth certain information with respect to our executive officers as of December 31, 2009.

            The executive officers of Simon Property serve at the pleasure of the Board of Directors. For biographical information of David Simon, Richard S. Sokolov, Stephen E. Sterrett, James M. Barkley and John Rulli, see Item 10 of this report.

            Mr. Lewis is the Senior Executive Vice President and President of Leasing of Simon Property. Mr. Lewis joined Melvin Simon & Associates, Inc., or MSA, in 1986 and held various positions with MSA and Simon Property prior to becoming Senior Executive Vice President and President of Leasing. In 2002 he was appointed to Executive Vice President — Leasing and in 2007 he became Senior Executive Vice President and President of Leasing.

            Mr. Juster serves as Simon Property's Executive Vice President and Treasurer. He joined MSA in 1989 and held various financial positions with MSA until 1993 and thereafter has held various positions with Simon Property. Mr. Juster became Treasurer in 2001 and was promoted to Executive Vice President in 2008.

            Mr. Broadwater serves as Simon Property's Senior Vice President and Chief Accounting Officer and prior to that as Vice President and Corporate Controller. Mr. Broadwater joined Simon Property in 2004 and was promoted to Chief Accounting Officer in 2009.

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Item 1A. Risk Factors

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

Risks Relating to Debt and the Financial Markets

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

            As of December 31, 2009, our consolidated mortgages and other indebtedness, excluding the related premium and discount, totaled $18.6 billion. We are subject to the risks normally associated with debt financing, including the risk that our cash flow from operations will be insufficient to meet required debt service. Our debt service costs generally will not be reduced if developments at the property, such as the entry of new competitors or the loss of major tenants, cause a reduction in the income from the property. Should such events occur, our operations may be adversely affected. If a property is mortgaged to secure payment of indebtedness and income from this is insufficient to pay that indebtedness, the property could be foreclosed upon by the mortgagee resulting in a loss of income and a decline in our total asset value.

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

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

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

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

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

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

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

Factors Affecting Real Estate Investments and Operations

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

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

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

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

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

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

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

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

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

Real estate investments are relatively illiquid.

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

Environmental Risks

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

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

Our efforts to identify environmental liabilities may not be successful.

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

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

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

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

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

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Retail Operations Risks

Ongoing economic conditions are adversely affecting the general retail environment.

            Our concentration in the retail real estate market means that we are subject to the risks that affect the retail environment generally, including the levels of consumer spending, seasonality, the willingness of retailers to lease space in our shopping centers, tenant bankruptcies, changes in economic conditions, consumer confidence and terrorist activities. The economy appears to be recovering from the recent recession during which consumer spending in the United States declined significantly. The unemployment rate remains relatively high and consumer confidence remains relatively depressed. We derive our cash flow from operations primarily from retail tenants, many of whom are currently under considerable economic stress. A significant deterioration in our cash flow from operations could require us to curtail planned capital expenditures or seek alternative sources of financing.

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

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

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

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

We face potential adverse effects from the increasing number of tenant bankruptcies.

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

Risks Relating to Joint Venture Properties

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

            As of December 31, 2009, we owned interests in 182 income-producing properties with other parties. Of those, 18 properties are included in our consolidated financial statements. We account for the other 164 properties under the equity method of accounting, which we refer to as joint venture properties. We serve as general partner or property manager for 93 of these 164 properties; however, certain major decisions, such as selling or refinancing these properties, require the consent of the other owners. Of the properties for which we do not serve as general partner or property manager, 61 are in our international joint ventures. The other owners also have other participating rights that we consider substantive for purposes of determining control over the properties' assets. The remaining joint venture

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properties are managed by third parties. These limitations may adversely affect our ability to sell, refinance, or otherwise operate these properties.

The Operating Partnership guarantees debt or otherwise provides support for a number of joint venture properties.

            Joint venture debt is the liability of the joint venture and is typically secured by a mortgage on the joint venture property. As of December 31, 2009, the Operating Partnership has loan guarantees to support $47.2 million of our total $6.5 billion share of joint venture mortgage and other indebtedness. A default by a joint venture under its debt obligations may expose us to liability under a guaranty or letter of credit.

Other Factors Affecting Our Business

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

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

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

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

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

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

            We hold interests in joint venture properties that operate in Italy, France, Poland, Japan, Korea, and Mexico, and we have a minority investment in common shares of a U.K. retail real estate company. We may pursue additional expansion opportunities outside the United States. International development and ownership activities carry risks that are different from those we face with our domestic properties and operations. These risks include:

•

adverse effects of changes in exchange rates for foreign currencies;

•

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

•

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

•

differing lending practices;

•

differences in cultures;

•

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

•

difficulties in managing international operations; and

•

obstacles to the repatriation of earnings and cash.

            Although our international activities currently are a relatively small portion of our business (international properties represented approximately 6.3% of the GLA of all of our properties at December 31, 2009), to the extent that we expand our international activities, these risks could increase in significance which in turn could adversely affect our results of operations and financial condition.

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

            We maintain commercial general liability, fire, flood, extended coverage and rental loss insurance on all of our properties in the United States through wholly-owned captive insurance entities and other self-insurance mechanisms. Rosewood Indemnity, Ltd. and Bridgewood Insurance Company, Ltd. are our wholly-owned captive insurance subsidiaries, and have agreed to indemnify our general liability carrier for a specific layer of losses for the properties that are covered under these arrangements. The carrier has, in turn, agreed to provide evidence of coverage for this layer of losses under the terms and conditions of the carrier's policy. A similar policy written through these captive insurance entities also provides initial coverage for property insurance and certain windstorm risks at the properties located in coastal windstorm locations.

            There are some types of losses, including lease and other contract claims that generally are not insured. If an uninsured loss or a loss in excess of insured limits occurs, we could lose all or a portion of the capital we have invested in a property, as well as the anticipated future revenue from the property. If this happens, we may still remain obligated for any mortgage debt or other financial obligations related to the property.

            We currently maintain insurance coverage against acts of terrorism on all of our properties in the United States on an "all risk" basis in the amount of up to $1 billion per occurrence for certified foreign acts of terrorism and $500 million per occurrence for non-certified domestic acts of terrorism. The current federal laws which provide this coverage are expected to operate through 2014. Despite the existence of this insurance coverage, any threatened or actual terrorist attacks in high profile markets could adversely affect our property values, revenues, consumer traffic and tenant sales.

Risks Relating to Federal Income Taxes

We have elected to be taxed as a REIT.

            We have elected to be taxed as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended, or the Internal Revenue Code. We believe we have been organized and operated in a manner which allows us to qualify for taxation as a REIT under the Internal Revenue Code. We intend to continue to operate in this manner. However, our qualification and taxation as a REIT depend upon our ability to meet, through actual annual operating results, asset diversification, distribution levels and diversity of stock ownership, the various qualification tests imposed under the Internal Revenue Code. REIT qualification is governed by highly technical and complex provisions for which there are only limited judicial or administrative interpretations. Accordingly, there is no assurance that we have operated or will continue to operate in a manner so as to qualify or remain qualified as a REIT.

            If we fail to comply with those provisions, we may be subject to monetary penalties or ultimately to possible disqualification as a REIT. If such events occurs, and if available relief provisions do not apply:

•

we will not be allowed a deduction for distributions to stockholders in computing our taxable income;

•

we will be subject to corporate level income tax, including any applicable alternative minimum tax, on our taxable income at regular corporate rates; and

•

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

Item 1B. Unresolved Staff Comments

            None.

Item 2. Properties

United States Properties

            Our U.S. properties primarily consist of regional malls, Premium Outlet Centers, The Mills, community/lifestyle centers, and other properties. These properties contain an aggregate of approximately 244.8 million square feet of gross leasable area, or GLA, of which we own approximately 152.3 million square feet. Total estimated retail sales at the properties in 2009 were approximately $58 billion.

            Regional malls typically contain at least one traditional department store anchor or a combination of anchors and big box retailers with a wide variety of smaller stores connecting the anchors. Additional stores are usually located along the perimeter of the parking area. Our 162 regional malls are generally enclosed centers and range in size from

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approximately 400,000 to 2.3 million square feet of GLA. Our regional malls contain in the aggregate more than 18,600 occupied stores, including approximately 710 anchors, which are mostly national retailers. For comparative purposes, we separate the information in this section on the 16 regional malls acquired from The Mills Corporation in 2007, or the Mills Regional Malls, from the information on our other regional malls.

            Premium Outlet Centers generally contain a wide variety of designer and manufacturer stores located in an open-air center. Our 41 Premium Outlet Centers range in size from approximately 200,000 to 850,000 square feet of GLA. The Premium Outlet Centers are generally located near major metropolitan areas and tourist destinations including New York City, Los Angeles, Boston, Palm Springs, Orlando, Las Vegas, and Honolulu.

            The Mills generally range in size from 1.0 million to 2.3 million square feet of GLA and are located in major metropolitan areas. They have a combination of traditional mall, outlet center, and big box retailers and entertainment uses. The Mills Regional Malls typically range in size from 700,000 to 1.3 million square feet of GLA and contain a wide variety of national retailers.

            Community/lifestyle centers are generally unenclosed and smaller than our regional malls. Our 67 community/lifestyle centers generally range in size from approximately 100,000 to 900,000 square feet of GLA. Community/lifestyle centers are designed to serve a larger trade area and typically contain anchor stores and other national retail tenants, which occupy a significant portion of the GLA of the center. We also own traditional community shopping centers that focus primarily on value-oriented and convenience goods and services. These centers are usually anchored by a supermarket, discount retailer, or drugstore and are designed to service a neighborhood area. Finally, we own open-air centers adjacent to our regional malls designed to take advantage of the drawing power of the mall.

            We also have interests in 15 other shopping centers or outlet centers. These properties range in size from approximately 85,000 to 1.0 million square feet of GLA, are considered non-core to our business model, and in total represent less than 1% of our total operating income before depreciation.

            The following table provides representative data for our U.S. properties on a gross basis as of December 31, 2009:

            As of December 31, 2009, approximately 92.1% of the owned GLA in regional malls and the retail space of the other properties was leased, approximately 97.9% of owned GLA in the Premium Outlet Centers was leased, approximately 93.9% of the owned GLA for The Mills and 89.3% of owned GLA for the Mills Regional Malls was leased, and approximately 90.7% of owned GLA in the community/lifestyle centers was leased.

            We hold a 100% interest in 200 of our properties, effectively control 18 properties in which we have a joint venture interest, and hold the remaining 103 properties through unconsolidated joint venture interests. We are the managing or co-managing general partner or member of 311 properties. Substantially all of our joint venture properties are subject to rights of first refusal, buy-sell provisions, or other sale rights for all partners which are customary in real estate partnership agreements and the industry. Our partners in our joint ventures may initiate these provisions at any time, which will result in either the use of available cash or borrowings to acquire their partnership interest or the disposal of our partnership interest.

            The following property table summarizes certain data for our regional malls, Premium Outlet Centers, The Mills, the Mills Regional Malls and community/lifestyle centers located in the United States, including Puerto Rico, as of December 31, 2009.

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FOOTNOTES:

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(1)

This property is managed by a third party.

(2)

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

(3)

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

(4)

Joint venture properties accounted for under the equity method.

(5)

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

(6)

Indicates anchor or major that is currently under development.

(7)

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

(8)

Indicates vacant anchor space(s).

(9)

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

(10)

Indicates ground lease covers outparcel only.

(11)

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

(12)

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

(13)

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

(14)

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

(15)

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

(16)

Indicates anchor has announced its intent to close this location.

(17)

Mall & Freestanding GLA includes office space as follows:

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International Properties

            Our ownership interests in properties outside the United States are primarily owned through joint venture arrangements. However, we have a direct minority investment in Liberty International, PLC, or Liberty, as further described below.

European Investments

            The following summarizes our joint venture investments in Europe and the underlying countries in which these joint ventures own and operate real estate properties as of December 31, 2009:

            In addition, we jointly hold with a third party an interest in one parcel of land for development near Paris, France outside of these two joint ventures. Simon Ivanhoe and GCI are fully integrated European retail real estate developers, owners and managers.

            Our properties in Europe consist primarily of hypermarket-anchored shopping centers. Substantially all of our European properties are anchored by either the hypermarket retailer Auchan, primarily in Italy, who is also our partner in GCI, or are anchored by the hypermarket Carrefour in France and Poland. Certain of the properties in Italy are subject to leaseholds whereby GCI leases all or a portion of the premises from a third party who is entitled to receive substantially all the economic benefits of that portion of the properties. Auchan and Carrefour are the two largest hypermarket operators in Europe. These centers comprise over 13.4 million square feet of GLA and were 95.9% leased as of December 31, 2009.

            On February 4, 2010, we and our partner in Simon Ivanhoe, Ivanhoe Cambridge Inc., or Ivanhoe Cambridge, entered into a definitive agreement to sell all of the interests in Simon Ivanhoe which owns seven shopping centers located in France and Poland to Unibail-Rodamco. The joint venture partners will receive consideration of €715 million for their interests, subject to certain post-closing adjustments. We expect our share of the gain on sale of our interests in Simon Ivanhoe to be approximately $300 million. The transaction is scheduled to close during the first half of 2010, subject to customary closing conditions and regulatory approvals.

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

Other International Investments

            We also hold real estate interests in eight joint venture properties in Japan, one joint venture property in Mexico, and one joint venture property in Korea. The eight Japanese Premium Outlet Centers operate in various cities throughout Japan and are held in a joint venture with Mitsubishi Estate Co., Ltd. These centers comprise over 2.4 million square feet of GLA and were 99.6% leased as of December 31, 2009.

            The following summarizes our holdings in these international joint ventures and the underlying countries in which these joint ventures own and operate real estate properties as of December 31, 2009:

            In 2009, we completed construction and opened Ami Premium Outlets, a 224,500 square foot center located outside Tokyo, Japan. We have a 40% interest in this property consistent with the ownership structure of our other Japanese investments. We also completed construction and opened a 171,800 square foot expansion at Kobe-Sanda Premium Outlets in Hyougo-ken, Japan. Also in December 2009, we recognized a loss on our joint venture interests in

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our shopping centers in China. We sold our interests to affiliates of our Chinese partner for approximately $29 million, resulting in a loss of approximately $20 million.

            We hold a minority interest in Liberty which is a U.K. Real Estate Investment Trust that operates regional shopping centers and owns other prime retail assets throughout the U.K. Liberty is a U.K. FTSE 100 listed company, with shareholders' funds of £3.2 billion and property investments of £6.1 billion, of which its U.K. regional shopping centers comprise 70%. Assets of the group under control or joint control amount to £9.3 billion. Our interest in Liberty is less than 6% of its outstanding shares. We adjust the carrying value of this investment quarterly using quoted market prices, including a related foreign exchange component.

            The following property table summarizes certain data for our properties located in Europe, Japan, Mexico, and Korea at December 31, 2009.

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FOOTNOTES:

(1)

All gross leasable area listed in square feet.

(2)

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

(3)

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

(4)

Represents the sales area of the anchor and excludes any warehouse/storage areas.

(5)

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

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Land

            We have direct or indirect ownership interests in approximately 700 acres of land held in the United States for future development.

Sustainability and Energy Efficiency

            Due to the size of our portfolio, we focus on energy efficiency as a core sustainability strategy. Through the continued use of energy conservation practices, energy efficiency projects, and continuous monitoring and reporting, we have reduced our energy consumption at comparable properties every year since 2003. As a result, excluding new developments and expansions, we reduced the electricity usage over which we have direct control by 238 million kWhs since 2003. This represents a 17% percent reduction in electricity usage across a portfolio of comparable properties and reflects an annual value of over $27.5 million in avoided operating costs. Our documented reduction in greenhouse gas emissions resulting from our energy management efforts is 140,000 metric tons CO2e.

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

Mortgage Financing on Properties

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

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MORTGAGE AND OTHER DEBT ON PORTFOLIO PROPERTIES
As of December 31, 2009
(Dollars in thousands)

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MORTGAGE AND OTHER DEBT ON PORTFOLIO PROPERTIES
As of December 31, 2009
(Dollars in thousands)

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MORTGAGE AND OTHER DEBT ON PORTFOLIO PROPERTIES
As of December 31, 2009
(Dollars in thousands)