Segment Information - Schedule of Reconciliation of Revenues and Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property revenue	$ 470,942	$ 448,135	$ 1,400,641	$ 1,312,132
Property operating expenses, including real estate taxes	143,436	134,792	417,486	387,824
Net operating income	327,506	313,343	983,155	924,308
Management and other fees from affiliates	2,361	2,563	7,078	7,849
Corporate-level property management expenses	(12,216)	(11,610)	(36,768)	(34,331)
Depreciation and amortization	(151,489)	(146,439)	(454,277)	(431,785)
General and administrative	(18,058)	(29,067)	(51,507)	(67,374)
Expensed acquisition and investment related costs	(25)	0	(25)	(68)
Gain on sale of real estate and land	62,320	0	299,524	0
Interest expense	(64,660)	(59,232)	(192,654)	(174,285)
Total return swap income	1,329	807	3,600	2,232
Interest and other income	5,900	11,449	16,997	78,292
Equity income from co-investments	17,798	11,649	39,984	33,667
Tax benefit on unconsolidated technology co-investments	1,958	441	2,353	1,199
Loss on early retirement of debt	0	0	(762)	0
Gain on remeasurement of co-investment	0	31,583	330	169,909
Net income	172,724	125,487	617,028	509,613
Operating Segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property revenue	190,626	181,673	568,992	530,051
Property operating expenses, including real estate taxes	57,828	53,584	167,422	154,727
Net operating income	132,798	128,089	401,570	375,324
Operating Segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property revenue	193,208	168,838	563,915	490,824
Property operating expenses, including real estate taxes	61,158	52,230	175,499	148,956
Net operating income	132,050	116,608	388,416	341,868
Operating Segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property revenue	79,240	74,576	234,751	220,271
Property operating expenses, including real estate taxes	23,333	22,597	67,691	65,619
Net operating income	55,907	51,979	167,060	154,652
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property revenue	7,868	23,048	32,983	70,986
Property operating expenses, including real estate taxes	1,117	6,381	6,874	18,522
Net operating income	$ 6,751	$ 16,667	$ 26,109	$ 52,464