Segment Information - Schedule of Reconciliation of Revenues and Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property	$ 467,610	$ 439,782	$ 929,699	$ 863,997
Property operating expenses, including real estate taxes	135,429	126,534	274,050	253,032
Total net operating income	332,181	313,248	655,649	610,965
Management and other fees from affiliates	2,223	2,573	4,717	5,286
Corporate-level property management expenses	(12,220)	(11,622)	(24,552)	(22,721)
Depreciation and amortization	(151,501)	(145,613)	(302,788)	(285,346)
General and administrative	(17,157)	(21,136)	(33,449)	(38,307)
Expensed acquisition and investment related costs	0	0	0	(68)
Gain on sale of real estate and land	126,174	0	237,204	0
Interest expense	(65,262)	(59,120)	(127,994)	(115,053)
Total return swap income	1,071	629	2,271	1,425
Interest and other income	6,808	9,568	11,097	66,843
Equity income from co-investments	8,977	9,652	22,186	22,018
Tax benefit on unconsolidated technology co-investments	232	807	395	758
Loss on early retirement of debt	0	0	(762)	0
Gain on remeasurement of co-investment	0	0	330	138,326
Net income	231,526	98,986	444,304	384,126
Management and other fees from affiliates
Revenues from External Customers and Long-Lived Assets [Line Items]
Management and other fees from affiliates			4,717	5,286
Operating Segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property	189,744	179,488	378,366	348,378
Property operating expenses, including real estate taxes	54,964	51,411	109,594	101,143
Total net operating income	134,780	128,077	268,772	247,235
Operating Segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property	191,026	164,083	373,209	324,523
Property operating expenses, including real estate taxes	58,828	47,702	115,592	97,969
Total net operating income	132,198	116,381	257,617	226,554
Operating Segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property	78,297	73,782	155,511	145,695
Property operating expenses, including real estate taxes	20,456	21,895	44,358	43,022
Total net operating income	57,841	51,887	111,153	102,673
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property	8,543	22,429	22,613	45,401
Property operating expenses, including real estate taxes	1,181	5,526	4,506	10,898
Total net operating income	$ 7,362	$ 16,903	$ 18,107	$ 34,503