Revenues - Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) community	Mar. 31, 2023 USD ($)
Disaggregation of Revenue [Line Items]
Rental and other property	$ 424,215	$ 409,656
Management and other fees from affiliates	2,713	2,765
Revenues	$ 426,928	412,421
Apartment communities owned (in communities) | community	253
Rental income
Disaggregation of Revenue [Line Items]
Rental and other property	$ 417,236	404,635
Other property
Disaggregation of Revenue [Line Items]
Rental and other property	6,979	5,021
Rental and other property revenues
Disaggregation of Revenue [Line Items]
Rental and other property	424,215	409,656
Rental and other property revenues | Same-property
Disaggregation of Revenue [Line Items]
Rental and other property	$ 409,819	395,520
Occupancy threshold for classification as stabilized	90.00%
Rental and other property revenues | Acquisitions
Disaggregation of Revenue [Line Items]
Rental and other property	$ 1,598	0
Rental and other property revenues | Redevelopment
Disaggregation of Revenue [Line Items]
Rental and other property	1,541	1,537
Rental and other property revenues | Non-residential/other, net
Disaggregation of Revenue [Line Items]
Rental and other property	$ 11,320	12,023
Apartment communities owned (in communities) | community	2
Rental and other property revenues | Straight line rent concession
Disaggregation of Revenue [Line Items]
Rental and other property	$ (63)	576
Rental and other property revenues | Operating Segments | Southern California
Disaggregation of Revenue [Line Items]
Rental and other property	176,002	166,877
Rental and other property revenues | Operating Segments | Northern California
Disaggregation of Revenue [Line Items]
Rental and other property	168,839	163,728
Rental and other property revenues | Operating Segments | Seattle Metro
Disaggregation of Revenue [Line Items]
Rental and other property	71,913	70,038
Rental and other property revenues | Other real estate assets
Disaggregation of Revenue [Line Items]
Rental and other property	$ 7,461	$ 9,013