CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Investment in real estate
Land	$ 4,565,646	$ 4,367,816
Depreciable property	15,886,832	15,554,740
Projects under development	198,912	160,190
Land held for development	372,108	325,200
Investment in real estate	21,023,498	20,407,946
Accumulated depreciation	(4,777,887)	(4,539,583)
Investment in real estate, net	16,245,611	15,868,363
Cash and cash equivalents	44,585	383,921
Investments in unconsolidated entities	17,886	12,327
Deposits - restricted	193,892	152,237
Escrow deposits - mortgage	9,139	10,692
Deferred financing costs, net	41,854	44,608
Other assets	161,445	187,155
Total assets	16,714,412	16,659,303
Liabilities:
Mortgage notes payable	4,004,496	4,111,487
Notes, net	5,354,768	5,609,574
Lines of credit	35,000	0
Accounts payable and accrued expenses	72,647	35,206
Accrued interest payable	82,695	88,121
Other liabilities	430,650	291,289
Security deposits	68,265	65,286
Distributions payable	109,463	179,079
Total liabilities	10,157,984	10,380,042
Commitments and contingencies
Redeemable Noncontrolling Interests - Operating Partnership	452,203	416,404
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 June 30, 2012 and December 31, 2011	200,000	200,000
Common Shares of beneficial interest, $0.01 par value; 1,000,000,000 shares authorized; 300,961,645 shares issued and outstanding as of June 30, 2012 and 297,508,185 shares issued and outstanding as of December 31, 2011	3,010	2,975
Paid in capital	5,226,088	5,047,186
Retained earnings	654,235	615,572
Accumulated other comprehensive (loss)	(198,075)	(196,718)
Total shareholders' equity	5,885,258	5,669,015
Noncontrolling Interests:
Operating Partnership	144,521	119,536
Partially Owned Properties	74,446	74,306
Total Noncontrolling Interests	218,967	193,842
Total equity	6,104,225	5,862,857
Total liabilities and equity	$ 16,714,412	$ 16,659,303