Segment Information - Schedule of Reconciliation of Revenues and Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property	$ 462,089	$ 424,215
Property operating expenses, including real estate taxes	138,621	126,498
Total net operating income	323,468	297,717
Management and other fees from affiliates	2,494	2,713
Corporate-level property management expenses	(12,332)	(11,099)
Depreciation and amortization	(151,287)	(139,733)
General and administrative	(16,292)	(17,171)
Expensed acquisition and investment related costs	0	(68)
Gain on sale of real estate and land	111,030	0
Interest expense	(62,732)	(55,933)
Total return swap income	1,200	796
Interest and other income	4,289	57,275
Equity income from co-investments	13,209	12,366
Tax benefit (expense) on unconsolidated co-investments	163	(49)
Loss on early retirement of debt	(762)	0
Gain on remeasurement of co-investment	330	138,326
Net income	212,778	285,140
Operating Segments | Southern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property	188,622	168,890
Property operating expenses, including real estate taxes	54,630	49,733
Total net operating income	133,992	119,157
Operating Segments | Northern California
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property	184,344	162,656
Property operating expenses, including real estate taxes	57,695	51,171
Total net operating income	126,649	111,485
Operating Segments | Seattle Metro
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property	77,214	71,913
Property operating expenses, including real estate taxes	23,902	21,126
Total net operating income	53,312	50,787
Other real estate assets
Revenues from External Customers and Long-Lived Assets [Line Items]
Rental and other property	11,909	20,756
Property operating expenses, including real estate taxes	2,394	4,468
Total net operating income	$ 9,515	$ 16,288