Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
ASSETS
Land and improvements	$ 1,307,608	$ 1,166,409
Buildings and tenant improvements	5,601,866	5,396,339
Construction in progress	41,490	61,205
Investments in and advances to unconsolidated companies	368,671	367,445
Undeveloped land	622,254	625,353
Real estate investment property, at cost, total	7,941,889	7,616,751
Accumulated depreciation	(1,413,804)	(1,290,417)
Net real estate investments	6,528,085	6,326,334
Real estate investments and other assets held-for-sale	21,992	394,287
Cash and cash equivalents	16,182	18,384
Accounts receivable, net of allowance of $2,854 and $2,945	21,685	22,588
Straight-line rent receivable, net of allowance of $7,502 and $7,260	140,732	125,185
Receivables on construction contracts, including retentions	44,425	7,408
Deferred financing costs, net of accumulated amortization of $56,105 and $46,407	39,449	46,320
Deferred leasing and other costs, net of accumulated amortization of $329,325 and $269,000	497,594	517,934
Escrow deposits and other assets	194,517	185,836
Assets, total	7,504,661	7,644,276
LIABILITIES AND EQUITY
Secured debt	1,184,268	1,065,628
Unsecured notes	2,783,762	2,948,405
Unsecured lines of credit	304,293	193,046
Long-term debt, total	4,272,323	4,207,079
Liabilities related to real estate investments held-for-sale	957	14,732
Construction payables and amounts due subcontractors, including retentions	66,786	44,782
Accrued real estate taxes	123,524	83,615
Accrued interest	35,725	62,407
Other accrued expenses	42,729	61,448
Other liabilities	128,123	129,860
Tenant security deposits and prepaid rents	59,551	50,450
Total liabilities	4,729,718	4,654,373
Shareholders' equity:
Preferred shares ($.01 par value); 5,000 shares authorized; 3,176 and 3,618 shares issued and outstanding	793,910	904,540
Common shares ($.01 par value); 400,000 shares authorized; 252,918 and 252,195 shares issued and outstanding	2,529	2,522
Additional paid-in capital	3,591,381	3,573,720
Accumulated other comprehensive income (loss)	493	(1,432)
Distributions in excess of net income	(1,678,484)	(1,533,740)
Total shareholders' equity	2,709,829	2,945,610
Noncontrolling interests	65,114	44,293
Total equity	2,774,943	2,989,903
Liabilities and stockholders' equity, total	$ 7,504,661	$ 7,644,276