Segment Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable operating segments defined by geographical regions | segment	3
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property revenues	$ 1,595,675,000	$ 1,431,418,000	$ 1,486,150,000
Total net operating income	1,128,406,000	986,182,000	1,045,538,000
Management and other fees from affiliates	11,139,000	9,138,000	9,598,000
Corporate-level property management expenses	(40,704,000)	(36,211,000)	(34,361,000)
Depreciation and amortization	(539,319,000)	(520,066,000)	(525,497,000)
General and administrative	(56,577,000)	(51,838,000)	(65,388,000)
Expensed acquisition and investment related costs	(2,132,000)	(203,000)	(1,591,000)
Impairment loss	0	0	(1,825,000)
Gain on sale of real estate and land	94,416,000	142,993,000	64,967,000
Interest expense	(204,798,000)	(203,125,000)	(220,633,000)
Total return swap income	7,907,000	10,774,000	10,733,000
Interest and other (loss) income	(19,040,000)	98,744,000	40,999,000
Equity income from co-investments	26,030,000	111,721,000	66,512,000
Deferred tax benefit (expense) on unconsolidated co-investments	10,236,000	(15,668,000)	(1,531,000)
Loss on early retirement of debt, net	(2,000)	(19,010,000)	(22,883,000)
Gain on remeasurement of co-investment	17,423,000	2,260,000	234,694,000
Net income	432,985,000	515,691,000	599,332,000
Assets:
Net reportable operating segments - real estate assets	10,814,094,000	10,983,073,000
Real estate under development	24,857,000	111,562,000
Co-investments	1,127,491,000	1,177,802,000
Cash and cash equivalents, including restricted cash	42,681,000	58,638,000
Marketable securities	112,743,000	191,829,000
Notes and other receivables	103,045,000	341,033,000
Operating lease right-of-use assets	67,239,000	68,972,000
Prepaid expenses and other assets	80,755,000	64,964,000
Total assets	12,372,905,000	12,997,873,000
Rental and other property
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property revenues	1,595,675,000	1,431,418,000	1,486,150,000
Management and other fees from affiliates
Revenues from External Customers and Long-Lived Assets [Line Items]
Management and other fees from affiliates	11,139,000	9,138,000	9,598,000
Operating segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net operating income	464,023,000	402,608,000	385,766,000
Assets:
Net reportable operating segments - real estate assets	3,925,251,000	3,956,814,000
Operating segments | Southern California | Rental and other property
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property revenues	652,742,000	580,305,000	558,839,000
Operating segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net operating income	445,763,000	401,870,000	431,047,000
Assets:
Net reportable operating segments - real estate assets	5,414,467,000	5,460,701,000
Operating segments | Northern California | Rental and other property
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property revenues	639,138,000	584,034,000	604,348,000
Operating segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net operating income	191,476,000	160,959,000	166,806,000
Assets:
Net reportable operating segments - real estate assets	1,374,379,000	1,407,033,000
Operating segments | Seattle Metro | Rental and other property
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property revenues	271,248,000	239,839,000	243,900,000
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net operating income	27,144,000	20,745,000	61,919,000
Assets:
Net reportable operating segments - real estate assets	99,997,000	158,525,000
Other real estate assets | Rental and other property
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property revenues	$ 32,547,000	$ 27,240,000	$ 79,063,000