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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	$ 313,883	$ 292,502	$ 925,981	$ 875,787
Management and other fees from affiliates	2,563	2,785	7,849	8,328
Corporate-level property management expenses	(12,150)	(11,504)	(36,004)	(34,387)
Depreciation and amortization	(146,439)	(137,357)	(431,785)	(410,422)
General and administrative	(29,067)	(14,611)	(67,374)	(43,735)
Expensed acquisition and investment related costs	0	(31)	(68)	(375)
Casualty loss	0	0	0	(433)
Gain on sale of real estate and land	0	0	0	59,238
Interest expense	(59,232)	(54,161)	(174,285)	(157,806)
Total return swap income	807	690	2,232	2,544
Interest and other income	11,449	4,406	78,292	29,055
Equity income from co-investments	11,649	10,694	33,667	33,802
Tax benefit (expense) on unconsolidated co-investments	441	(404)	1,199	(1,237)
Gain on remeasurement of co-investment	31,583	0	169,909	0
Net income	125,487	93,009	509,613	360,359
Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	448,135	416,398	1,312,132	1,239,319
Management and other fees from affiliates
Revenues from External Customers and Long-Lived Assets [Line Items]
Management and other fees from affiliates	2,563	2,785	7,849	8,328
Operating Segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	133,312	121,110	390,985	359,975
Operating Segments | Southern California | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	188,959	172,139	551,565	508,873
Operating Segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	119,450	112,985	348,042	336,090
Operating Segments | Northern California | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	172,163	162,104	501,042	480,431
Operating Segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	52,090	49,612	154,996	149,894
Operating Segments | Seattle Metro | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	74,576	70,630	220,271	210,885
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Net operating income	9,031	8,795	31,958	29,828
Other real estate assets | Rental and Other Property Revenues
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 12,437	$ 11,525	$ 39,254	$ 39,130