Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Segment Information [Abstract]
Number of reportable operating segments defined by geographical regions			3
Segment Reporting Information [Line Items]
Revenues	$ 118,118	$ 103,368	$ 345,984	$ 301,804
Net operating income	76,769	65,662	225,472	195,239
Depreciation	(38,137)	(31,531)	(112,563)	(93,068)
Interest expense before amortization expense	(22,096)	(21,025)	(66,612)	(61,085)
Amortization expense	(2,936)	(1,177)	(8,527)	(2,958)
Interest and other income	2,741	5,788	12,357	20,730
General and administrative	(6,066)	(6,175)	(18,551)	(17,988)
Impairment and other charges	0	(1,615)	0	(1,615)
Management and other fees from affiliates	1,940	959	4,585	3,458
Equity income (loss) from co-investments	317	(626)	(330)	(1,027)
Loss on early retirement of debt	(567)	0	(820)	(10)
Income before discontinued operations	11,965	10,260	35,011	41,676
Real Estate Assets	3,284,573		3,284,573		3,189,008
Real estate under development	145,226		145,226		217,531
Cash and cash equivalents	33,017		33,017		35,694
Marketable securities	75,624		75,624		92,310
Co-investments	275,410		275,410		107,840
Notes and other receivables	51,599		51,599		49,444
Other non-segment assets	39,716		39,716		41,060
Total assets	3,905,165		3,905,165		3,732,887
Southern California [Member]
Segment Reporting Information [Line Items]
Revenues	56,831	50,551	167,308	151,317
Net operating income	36,666	32,627	108,764	99,846
Real Estate Assets	1,482,611		1,482,611		1,428,264
Northern California [Member]
Segment Reporting Information [Line Items]
Revenues	37,757	32,770	109,624	92,731
Net operating income	24,790	20,922	72,129	59,966
Real Estate Assets	1,137,647		1,137,647		1,119,555
Seattle Metro [Member]
Segment Reporting Information [Line Items]
Revenues	20,530	17,932	60,495	51,377
Net operating income	12,964	10,882	38,294	31,581
Real Estate Assets	566,506		566,506		560,463
Other Real Estate Assets [Member]
Segment Reporting Information [Line Items]
Revenues	3,000	2,115	8,557	6,379
Net operating income	2,349	1,231	6,285	3,846
Real Estate Assets	$ 97,809		$ 97,809		$ 80,726

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- Definition

The net book value of real estate property held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(d))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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