Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Rental properties:
Land and land improvements	$ 836,134	$ 802,325
Buildings and improvements	3,331,463	3,265,014
Total Rental Properties	4,167,597	4,067,339
Less accumulated depreciation	(883,024)	(878,331)
Net Real Estate	3,284,573	3,189,008
Real estate under development	145,226	217,531
Co-investments	275,410	107,840
Total Real Estate	3,705,209	3,514,379
Cash and cash equivalents-unrestricted	9,020	13,753
Cash and cash equivalents-restricted	23,997	21,941
Marketable securities	75,624	92,310
Notes and other receivables	51,599	49,444
Prepaid expenses and other assets	22,225	25,188
Deferred charges, net	17,491	15,872
Total assets	3,905,165	3,732,887
Liabilities and Equity
Mortgage notes payable	1,750,439	1,832,745
Lines of credit	244,775	426,000
Unsecured bonds	265,000	0
Accounts payable and accrued liabilities	63,006	44,750
Construction payable	10,589	9,023
Dividends payable	39,015	36,405
Derivative liabilities	1,634	5,633
Other liabilities	20,135	18,968
Total liabilities	2,394,593	2,373,524
Commitments and contingencies
Cumulative convertible preferred stock; $.0001 par value:
4.875% Series G - 5,980,000 issued and 178,249 outstanding	4,349	4,349
Stockholders' equity and noncontrolling interest:
Common stock, $.0001 par value, 641,702,178 shares authorized 33,381,506 and 31,324,808 shares issued and outstanding	3	3
Cumulative redeemable preferred stock at liquidation	73,750	25,000
Additional paid-in capital	1,776,546	1,515,468
Distributions in excess of accumulated earnings	(386,752)	(313,308)
Accumulated other comprehensive (loss) income	(75,237)	(77,217)
Total stockholders' equity	1,388,310	1,149,946
Noncontrolling interest	117,913	205,068
Total stockholders' equity and noncontrolling interest	1,506,223	1,355,014
Total liabilities and equity	$ 3,905,165	$ 3,732,887