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Segment Information (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Segment Reporting Information [Line Items]
Real estate rental revenue	$ 71,931	$ 65,032	$ 212,819	$ 193,126
Real estate expenses	24,070	21,912	71,124	65,627
Net operating income	47,861	43,120	141,695	127,499
Depreciation and amortization	(23,479)	(20,224)	(67,899)	(59,574)
Interest expense	(16,508)	(16,717)	(50,266)	(49,662)
General and administrative	(3,837)	(3,141)	(11,588)	(10,455)
Acquisition costs	(1,600)		(3,571)	(452)
Other income	270	289	886	875
Loss on extinguishment of debt, net		(238)		(280)
Gain from non-disposal activities		4		4
Gain on sale of real estate	56,639		56,639	7,942
Income tax benefit (expense)	35		(1,138)
Gain (loss) from discontinued operations	3,655	3,565	9,522	11,047
Net income	63,036	6,658	74,280	26,944
Less: Net income attributable to noncontrolling interests	(28)	(33)	(85)	(109)
Net income attributable to the controlling interests	63,008	6,625	74,195	26,835
Capital expenditures	7,929	5,589	18,559	14,825
Total assets	2,236,352	2,310,979	2,236,352	2,310,979	2,167,881
Office [Member]
Segment Reporting Information [Line Items]
Real estate rental revenue	35,209	31,740	103,860	92,673
Real estate expenses	12,190	11,451	35,305	32,135
Net operating income	23,019	20,289	68,555	60,538
Capital expenditures	4,808	2,925	10,641	8,049
Total assets	1,134,692	964,235	1,134,692	964,235
Medical Office [Member]
Segment Reporting Information [Line Items]
Real estate rental revenue	11,351	10,993	34,002	33,695
Real estate expenses	3,656	3,635	10,747	11,190
Net operating income	7,695	7,358	23,255	22,505
Capital expenditures	926	676	2,883	3,398
Total assets	349,469	356,115	349,469	356,115
Retail [Member]
Segment Reporting Information [Line Items]
Real estate rental revenue	12,500	9,865	36,884	30,566
Real estate expenses	3,067	2,028	10,228	7,877
Net operating income	9,433	7,837	26,656	22,689
Capital expenditures	817	896	2,288	1,101
Total assets	369,162	224,707	369,162	224,707
Multifamily [Member]
Segment Reporting Information [Line Items]
Real estate rental revenue	12,871	12,434	38,073	36,192
Real estate expenses	5,157	4,798	14,844	14,425
Net operating income	7,714	7,636	23,229	21,767
Capital expenditures	1,260	548	1,901	1,279
Total assets	235,448	231,855	235,448	231,855
Industrial/Flex [Member]
Segment Reporting Information [Line Items]
Capital expenditures	(93)	452	404	742
Total assets	73,494	240,822	73,494	240,822
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Capital expenditures	211	92	442	256
Total assets	$ 74,087	$ 293,245	$ 74,087	$ 293,245

X

- Definition

The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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