CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	12 Months Ended
Dec. 31, 2010	Dec. 31, 2009
Investment in real estate
Land	$ 4,110,275	$ 3,650,324
Depreciable property	15,226,512	13,893,521
Projects under development	130,337	668,979
Land held for development	235,247	252,320
Investment in real estate	19,702,371	18,465,144
Accumulated depreciation	(4,337,357)	(3,877,564)
Investment in real estate, net	15,365,014	14,587,580
Cash and cash equivalents	431,408	193,288
Investments in unconsolidated entities	3,167	6,995
Deposits - restricted	180,987	352,008
Escrow deposits - mortgage	12,593	17,292
Deferred financing costs, net	42,033	46,396
Other assets	148,992	213,956
Total assets	16,184,194	15,417,515
Liabilities:
Mortgage notes payable	4,762,896	4,783,446
Notes, net	5,185,180	4,609,124
Lines of credit	0	0
Accounts payable and accrued expenses	39,452	58,537
Accrued interest payable	98,631	101,849
Other liabilities	304,202	272,236
Security deposits	60,812	59,264
Distributions payable	140,905	100,266
Total liabilities	10,592,078	9,984,722
Commitments and contingencies
Redeemable Noncontrolling Interests - Operating Partnership	383,540	258,280
Shareholders' equity:
Preferred Shares of beneficial interest, $0.01 par value; 100,000,000 shares authorized; 1,600,000 shares issued and outstanding as of December 31, 2010 and 1,950,925 shares issued and outstanding as of December 31, 2009	200,000	208,773
Common Shares of beneficial interest, $0.01 par value; 1,000,000,000 shares authorized; 290,197,242 shares issued and outstanding as of December 31, 2010 and 279,959,048 shares issued and outstanding as of December 31, 2009	2,902	2,800
Paid in capital	4,741,521	4,477,426
Retained earnings	203,581	353,659
Accumulated other comprehensive (loss) income	(57,818)	4,681
Total shareholders' equity	5,090,186	5,047,339
Noncontrolling Interests:
Operating Partnership	110,399	116,120
Partially Owned Properties	7,991	11,054
Total Noncontrolling Interests	118,390	127,174
Total equity	5,208,576	5,174,513
Total liabilities and equity	$ 16,184,194	$ 15,417,515

Carrying value as of the balance sheet date of obligations incurred and payable pertaining to goods and services received from vendors, are incurred in connection with contractual obligations or accumulate over time and for which invoices have not yet been received or will not be rendered.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Dollar value of issued common stock whether issued at par value, no par or stated value. This item includes treasury stock repurchased by the entity. Note: elements for number of common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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The current amount of expenditures for a real estate project that has not yet been completed.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid.

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable form a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale.

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Carrying amount of land available for development.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Total of all Liabilities and Stockholders' Equity items.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest).

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Carrying amount of the equity interests owned by noncontrolling partners in an operating partnership included in the entity's consolidated financial statements.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance-sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Carrying amount as of the balance sheet date of assets not otherwise specified in the taxonomy. Also serves as the sum of assets not individually reported in the financial statements, or not separately disclosed in notes.

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Carrying amount as of the balance sheet date of liabilities not otherwise specified in the taxonomy. Also serves as the sum of liabilities not individually reported in the financial statements, or not separately disclosed in notes.

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Carrying amount at the balance sheet date for long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, physical structures, machinery, vehicles, furniture, computer equipment, construction in progress, and similar items. Amount does not include depreciation.

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The cumulative amount of depreciation for real estate property held for investment purposes.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Carrying value as of the balance sheet date , including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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- Definition

This element represents money paid in advance to protect the provider of a product or service, such as a lessor, against damage or nonpayment by the buyer or tenant (lessee) during the term of the agreement. Such damages may include physical damage to the property, theft of property, and other contractual breaches. Security deposits held may be interest or noninterest bearing.

+ Details

Name:	us-gaap_SecurityDepositLiability
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total of all Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph A3

-Appendix A

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 4

-Section E

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_StockholdersEquityAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Total of Stockholders' Equity (deficit) items, net of receivables from officers, directors owners, and affiliates of the entity including portions attributable to both the parent and noncontrolling interests (previously referred to as minority interest), if any. The entity including portions attributable to the parent and noncontrolling interests is sometimes referred to as the economic entity. This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 25

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 26

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph A3

-Appendix A

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant