Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues:
Rental and related revenue	$ 233,555	$ 228,299	$ 698,619	$ 642,489
General contractor and service fee revenue	127,708	132,351	409,617	414,391
Revenues, total	361,263	360,650	1,108,236	1,056,880
Expenses:
Rental expenses	49,947	47,628	153,002	143,133
Real estate taxes	33,785	32,659	101,936	88,394
General contractor and other services expenses	120,547	124,653	379,180	392,433
Depreciation and amortization	96,909	94,487	290,751	253,209
Cost and expenses, total	301,188	299,427	924,869	877,169
Other operating activities:
Equity in earnings of unconsolidated companies	3,104	580	5,890	7,525
Gain on sale of properties	(1,437)	(125)	66,910	6,917
Undeveloped land carrying costs	(2,259)	(2,359)	(7,021)	(7,152)
Impairment charges	0	(1,860)	0	(9,834)
Other operating expenses	(60)	(580)	(171)	(1,002)
General and administrative expenses	(9,493)	(8,476)	(29,231)	(31,171)
Other operation transactions, total	(10,145)	(12,820)	36,377	(34,717)
Operating income	49,930	48,403	219,744	144,994
Other income (expenses):
Interest and other income, net	172	149	543	504
Interest expense	(66,875)	(61,491)	(199,269)	(175,076)
Loss on debt transactions	0	(167)	0	(16,294)
Acquisition-related activity	(342)	57,513	(1,525)	57,513
Income (loss) from continuing operations before income taxes	(17,115)	44,407	19,493	11,641
Income tax benefit	194	1,126	194	1,126
Income (loss) from continuing operations	(16,921)	45,533	19,687	12,767
Discontinued operations:
Income (loss) before gain on sales	(36)	375	(30)	2,293
Gain on sale of depreciable properties	2,088	11,527	16,405	24,383
Income from discontinued operations	2,052	11,902	16,375	26,676
Net income (loss)	(14,869)	57,435	36,062	39,443
Distributions on Preferred Units	(14,399)	(16,726)	(46,347)	(53,452)
Adjustments for redemption/repurchase of Preferred Units	(3,633)	(5,652)	(3,796)	(10,144)
Net (income) loss attributable to noncontrolling interests	(43)	48	163	(58)
Net income (loss) attributable to common unitholders	$ (32,944)	$ 35,105	$ (13,918)	$ (24,211)
Basic net income (loss) per Common Unit:
Continuing operations attributable to common unitholders	$ (0.14)	$ 0.08	$ (0.13)	$ (0.22)
Discontinued operations attributable to common unitholders	$ 0.01	$ 0.05	$ 0.07	$ 0.11
Total	$ (0.13)	$ 0.13	$ (0.06)	$ (0.11)
Diluted net income (loss) per Common Unit:
Continuing operations attributable to common unitholders	$ (0.14)	$ 0.08	$ (0.13)	$ (0.22)
Discontinued operations attributable to common unitholders	$ 0.01	$ 0.05	$ 0.07	$ 0.11
Total	$ (0.13)	$ 0.13	$ (0.06)	$ (0.11)
Weighted average number of Common Units outstanding	259,866	257,383	259,505	240,640
Weighted average number of Common Units and potential dilutive securities	259,866	257,383	259,505	240,640