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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Rental and other property revenue	$ 486,731	$ 467,610	$ 969,174	$ 929,699
Property operating expenses, including real estate taxes	141,022	135,429	282,278	274,050
Net operating income	345,709	332,181	686,896	655,649
Management and other fees from affiliates	2,318	2,223	4,631	4,717
Corporate-level property management expenses	(13,432)	(12,220)	(26,830)	(24,552)
Depreciation and amortization	(154,073)	(151,501)	(308,968)	(302,788)
General and administrative	(73,149)	(17,157)	(93,163)	(33,449)
Gain on sale of real estate and land	2,000	126,174	2,000	237,204
Interest expense	(66,835)	(65,262)	(132,399)	(127,994)
Total return swap income	1,226	1,071	2,768	2,271
Interest and other income	9,087	6,808	10,123	11,097
Equity income from co-investments	13,715	8,977	37,330	22,186
Tax benefit on unconsolidated technology co-investments	363	232	(3,251)	395
Loss on early retirement of debt	0	0	0	(762)
Gain on remeasurement of co-investment	0	0	0	330
Net income (loss)	66,929	231,526	179,137	444,304
Operating Segments | Southern California
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Rental and other property revenue	195,506	189,744	390,811	378,366
Property operating expenses, including real estate taxes	57,842	54,964	115,464	109,594
Net operating income	137,664	134,780	275,347	268,772
Operating Segments | Northern California
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Rental and other property revenue	205,088	189,791	406,706	370,707
Property operating expenses, including real estate taxes	59,512	58,195	119,859	114,341
Net operating income	145,576	131,596	286,847	256,366
Operating Segments | Seattle Metro
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Rental and other property revenue	79,633	78,297	158,654	155,511
Property operating expenses, including real estate taxes	23,355	20,456	46,435	44,358
Net operating income	56,278	57,841	112,219	111,153
Other real estate assets
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items]
Rental and other property revenue	6,504	9,778	13,003	25,115
Property operating expenses, including real estate taxes	313	1,814	520	5,757
Net operating income	$ 6,191	$ 7,964	$ 12,483	$ 19,358