Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) segment	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments | segment	3
Number of operating segments | segment	3
Net operating income	$ 289,244	$ 263,116
Management and other fees from affiliates	2,765	2,689
Corporate-level property management expenses	(11,432)	(10,172)
Depreciation and amortization	(136,347)	(133,533)
General and administrative	(15,311)	(12,242)
Expensed acquisition and investment related costs	(339)	(8)
Casualty loss	(433)	0
Gain on sale of real estate and land	59,238	0
Interest expense	(51,045)	(50,377)
Total return swap income	1,033	2,544
Interest and other income (loss)	12,450	(7,567)
Equity income from co-investments	10,871	21,171
Deferred tax benefit on unconsolidated co-investments	900	2,754
Net income	161,594	78,375
Net reportable operating segment - real estate assets	10,687,033		$ 10,814,094
Real estate under development	21,909		24,857
Co-investments	1,131,183		1,127,491
Cash and cash equivalents, including restricted cash	77,158	108,553	42,681	$ 58,638
Marketable securities, net of allowance for credit losses of zero as of both March 31, 2023 and December 31, 2022	107,002		112,743
Notes and other receivables	120,586		103,045
Operating lease right-of-use assets	66,373		67,239
Prepaid expenses and other assets	68,530		80,755
Total assets	12,279,774		12,372,905
Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	409,656	379,216
Management and other fees from affiliates
Revenues from External Customers and Long-Lived Assets [Line Items]
Management and other fees from affiliates	2,765	2,689
Operating Segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	116,942	107,802
Net reportable operating segment - real estate assets	3,859,639		3,892,003
Operating Segments | Southern California | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	166,877	153,339
Operating Segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	114,451	105,140
Net reportable operating segment - real estate assets	5,366,386		5,414,467
Operating Segments | Northern California | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	163,624	152,745
Operating Segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	49,894	43,296
Net reportable operating segment - real estate assets	1,364,364		1,374,379
Operating Segments | Seattle Metro | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	70,038	64,203
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	7,957	6,878
Net reportable operating segment - real estate assets	96,644		$ 133,245
Other real estate assets | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 9,117	$ 8,929