Revenues - Schedule of Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) community	Mar. 31, 2024 USD ($)
Disaggregation of Revenue [Line Items]
Rental and other property	$ 462,089	$ 424,215
Management and other fees from affiliates	2,494	2,713
Revenues	$ 464,583	426,928
Apartment communities owned (in communities) | community	258
Operating Segments | Southern California
Disaggregation of Revenue [Line Items]
Rental and other property	$ 188,622	168,890
Operating Segments | Northern California
Disaggregation of Revenue [Line Items]
Rental and other property	184,344	162,656
Operating Segments | Seattle Metro
Disaggregation of Revenue [Line Items]
Rental and other property	77,214	71,913
Other real estate assets
Disaggregation of Revenue [Line Items]
Rental and other property	11,909	20,756
Rental income
Disaggregation of Revenue [Line Items]
Rental and other property	455,860	417,236
Other property
Disaggregation of Revenue [Line Items]
Rental and other property	6,229	6,979
Rental and other property revenues
Disaggregation of Revenue [Line Items]
Rental and other property	462,089	424,215
Rental and other property revenues | Same-property
Disaggregation of Revenue [Line Items]
Rental and other property	$ 409,147	395,584
Occupancy threshold for classification as stabilized	90.00%
Rental and other property revenues | Acquisitions
Disaggregation of Revenue [Line Items]
Rental and other property	$ 34,770	1,598
Rental and other property revenues | Non-residential/other, net
Disaggregation of Revenue [Line Items]
Rental and other property	$ 18,560	27,096
Apartment communities owned (in communities) | community	2
Rental and other property revenues | Straight line rent concession
Disaggregation of Revenue [Line Items]
Straight line rent concession	$ (388)	(63)
Rental and other property revenues | Operating Segments | Southern California
Disaggregation of Revenue [Line Items]
Rental and other property	188,622	168,890
Rental and other property revenues | Operating Segments | Northern California
Disaggregation of Revenue [Line Items]
Rental and other property	184,344	162,656
Rental and other property revenues | Operating Segments | Seattle Metro
Disaggregation of Revenue [Line Items]
Rental and other property	77,214	71,913
Rental and other property revenues | Other real estate assets
Disaggregation of Revenue [Line Items]
Rental and other property	$ 11,909	$ 20,756