Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Investment in Real Estate:
Land	$ 553,539	$ 485,790
Buildings and Improvements	2,080,953	1,843,134
Construction in Progress	26,482	2,672
Less: Accumulated Depreciation	(577,591)	(443,912)
Net Investment in Real Estate	2,083,383	1,887,684
Real Estate and Other Assets Held for Sale, Net of Accumulated Depreciation and Amortization of $34,443 and $148,407	78,855	344,353
Investments in and Advances to Other Real Estate Partnerships	186,452	252,541
Cash and Cash Equivalents	7,624	22,484
Restricted Cash	0	105
Tenant Accounts Receivable, Net	2,685	2,602
Investments in Joint Ventures	1,674	2,451
Deferred Rent Receivable, Net	43,981	32,383
Deferred Financing Costs, Net	13,989	14,492
Deferred Leasing Intangibles, Net	33,375	33,639
Prepaid Expenses and Other Assets, Net	119,095	119,052
Total Assets	2,571,113	2,711,786
Liabilities:
Mortgage and Other Loans Payable, Net	584,288	431,284
Senior Unsecured Debt, Net	640,227	879,529
Unsecured Credit Facility	149,000	376,184
Mortgage Loan Payable on Real Estate Held for Sale, Net, Inclusive of $0 and $6 of Accrued Interest	0	1,014
Accounts Payable, Accrued Expenses and Other Liabilities, Net	77,379	79,949
Deferred Leasing Intangibles, Net	14,442	16,145
Rents Received in Advance and Security Deposits	23,095	24,469
Leasing Intangibles Held for Sale, Net of Accumulated Amortization of $415 and $2,642	690	1,909
Total Liabilities	1,489,121	1,810,483
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 (86,807,402 and 68,841,296 units issued and outstanding)	737,914	558,496
Limited Partners' Units (5,237,367 and 5,363,151 units issued and outstanding)	90,246	93,100
Accumulated Other Comprehensive Loss	(12,379)	(16,504)
Total Partners' Capital	1,081,992	901,303
Total Liabilities and Partners' Capital	$ 2,571,113	$ 2,711,786