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Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Assets |  |
Land | $ 868,964 | $ 768,016
Buildings and improvements | 5,068,560 | 4,751,654
Real estate assets, at cost, total | 5,937,524 | 5,519,670
Accumulated depreciation | (1,458,451) | (1,432,799)
Net operating real estate assets | 4,479,073 | 4,086,871
Properties under development, including land | 301,282 | 299,870
Investments in joint ventures | 49,436 | 44,844
Properties held for sale | 0 | 11,131
Total real estate assets | 4,829,791 | 4,442,716
Accounts receivable - affiliates | 29,742 | 31,035
Other assets, net | 89,706 | 88,089
Cash and cash equivalents | 49,702 | 55,159
Restricted cash | 5,074 | 5,076
Total assets | 5,004,015 | 4,622,075
Liabilities |  |
Unsecured notes payable | 1,380,952 | 1,380,755
Secured notes payable | 1,050,154 | 1,051,357
Accounts payable and accrued expenses | 105,370 | 93,747
Accrued real estate taxes | 17,991 | 21,883
Distributions payable | 47,594 | 39,364
Other liabilities | 90,423 | 109,276
Total liabilities | 2,692,484 | 2,696,382
Commitments and contingencies |  |
Perpetual preferred units | 0 | 97,925
Equity |  |
Common shares of beneficial interest; $0.01 par value per share; 100,000 shares authorized; 94,927 and 87,377 issued; 91,957 and 84,517 outstanding at March 31, 2012 and December 31, 2011, respectively | 919 | 845
Additional paid-in capital | 3,327,961 | 2,901,024
Distributions in excess of net income attributable to common shareholders | (648,074) | (690,466)
Treasury shares, at cost (12,100 and 12,509 common shares at March 31, 2012 and December 31, 2011, respectively) | (437,215) | (452,003)
Accumulated other comprehensive loss | (675) | (683)
Total common equity | 2,242,916 | 1,758,717
Noncontrolling interests | 68,615 | 69,051
Total equity | 2,311,531 | 1,827,768
Total liabilities and equity | $ 5,004,015 | $ 4,622,075

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