Revenues - Summary of Disaggregation of Revenue (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) community	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Rental and other property	$ 1,595,675	$ 1,431,418	$ 1,486,150
Management and other fees from affiliates	11,139	9,138	9,598
Total revenues	$ 1,606,814	1,440,556	1,495,748
Occupancy threshold for classification as stabilized	90.00%
Apartment communities owned (in communities) | community	252
Rental income
Disaggregation of Revenue [Line Items]
Rental and other property	$ 1,573,368	1,410,197	1,462,161
Other property
Disaggregation of Revenue [Line Items]
Rental and other property	22,307	21,221	23,989
Rental and other property
Disaggregation of Revenue [Line Items]
Rental and other property	1,595,675	1,431,418	1,486,150
Straight line rent concession	(5,119)	(10,811)	21,856
Rental and other property | Same-property
Disaggregation of Revenue [Line Items]
Rental and other property	1,484,976	1,346,680	1,363,241
Rental and other property | Acquisitions
Disaggregation of Revenue [Line Items]
Rental and other property	8,793	2,239	0
Rental and other property | Development
Disaggregation of Revenue [Line Items]
Rental and other property	43,139	31,270	20,050
Rental and other property | Redevelopment
Disaggregation of Revenue [Line Items]
Rental and other property	5,766	6,169	6,931
Rental and other property | Non-residential/other, net
Disaggregation of Revenue [Line Items]
Rental and other property	$ 58,120	55,871	74,072
Apartment communities owned (in communities) | community	2
Rental and other property | Operating segments | Southern California
Disaggregation of Revenue [Line Items]
Rental and other property	$ 652,742	580,305	558,839
Rental and other property | Operating segments | Northern California
Disaggregation of Revenue [Line Items]
Rental and other property	639,138	584,034	604,348
Rental and other property | Operating segments | Seattle Metro
Disaggregation of Revenue [Line Items]
Rental and other property	271,248	239,839	243,900
Rental and other property | Other real estate assets
Disaggregation of Revenue [Line Items]
Rental and other property	$ 32,547	$ 27,240	$ 79,063