Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Investment in Real Estate:
Land	$ 601,609	$ 553,539
Buildings and Improvements	2,118,037	2,080,953
Construction in Progress	34,948	26,482
Less: Accumulated Depreciation	(612,784)	(577,591)
Net Investment in Real Estate	2,141,810	2,083,383
Real Estate and Other Assets Held for Sale, Net of Accumulated Depreciation and Amortization of $20,690 and $34,443	42,930	78,855
Investments in and Advances to Other Real Estate Partnerships	186,375	186,452
Cash and Cash Equivalents	4,301	7,624
Tenant Accounts Receivable, Net	1,146	2,685
Investments in Joint Ventures	1,258	1,674
Deferred Rent Receivable, Net	46,384	43,981
Deferred Financing Costs, Net	11,803	13,989
Deferred Leasing Intangibles, Net	33,028	33,375
Prepaid Expenses and Other Assets, Net	107,927	119,095
Total Assets	2,576,962	2,571,113
Liabilities:
Mortgage and Other Loans Payable, Net	578,851	584,288
Senior Unsecured Notes, Net	492,341	640,227
Unsecured Credit Facility	306,000	149,000
Accounts Payable, Accrued Expenses and Other Liabilities, Net	76,391	77,379
Deferred Leasing Intangibles, Net	14,355	14,442
Rents Received in Advance and Security Deposits	22,744	23,095
Leasing Intangibles Held for Sale, Net of Accumulated Amortization of $0 and $415		690
Total Liabilities	1,490,682	1,489,121
Commitments and Contingencies
Partners' Capital:
General Partner Preferred Units (1,550 units issued and outstanding) with a liquidation preference of $275,000	266,211	266,211
General Partner Units (88,912,253 and 86,807,402 units issued and outstanding)	741,989	737,914
Limited Partners' Units (4,956,376 and 5,237,367 units issued and outstanding)	86,732	90,246
Accumulated Other Comprehensive Loss	(8,652)	(12,379)
Total Partners' Capital	1,086,280	1,081,992
Total Liabilities and Partners' Capital	$ 2,576,962	$ 2,571,113