Revenues - Schedule of Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) community	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) community	Sep. 30, 2023 USD ($)
Disaggregation of Revenue [Line Items]
Rental and other property	$ 448,135	$ 416,398	$ 1,312,132	$ 1,239,319
Management and other fees from affiliates	2,563	2,785	7,849	8,328
Revenues	$ 450,698	419,183	$ 1,319,981	1,247,647
Apartment communities owned (in communities) | community	255		255
Rental income
Disaggregation of Revenue [Line Items]
Rental and other property	$ 440,649	410,438	$ 1,290,026	1,222,859
Other property
Disaggregation of Revenue [Line Items]
Rental and other property	7,486	5,960	22,106	16,460
Rental and other property revenues
Disaggregation of Revenue [Line Items]
Rental and other property	448,135	416,398	1,312,132	1,239,319
Rental and other property revenues | Same-property
Disaggregation of Revenue [Line Items]
Rental and other property	$ 413,213	399,292	$ 1,225,302	1,184,018
Occupancy threshold for classification as stabilized	90.00%		90.00%
Rental and other property revenues | Acquisitions
Disaggregation of Revenue [Line Items]
Rental and other property	$ 16,964	383	$ 31,386	608
Rental and other property revenues | Redevelopment
Disaggregation of Revenue [Line Items]
Rental and other property	1,671	1,564	4,777	4,696
Rental and other property revenues | Non-residential/other, net
Disaggregation of Revenue [Line Items]
Rental and other property	$ 16,514	16,553	$ 51,468	51,490
Apartment communities owned (in communities) | community	2		2
Rental and other property revenues | Straight line rent concession
Disaggregation of Revenue [Line Items]
Rental and other property	$ (227)	(1,394)	$ (801)	(1,493)
Rental and other property revenues | Operating Segments | Southern California
Disaggregation of Revenue [Line Items]
Rental and other property	188,959	172,139	551,565	508,873
Rental and other property revenues | Operating Segments | Northern California
Disaggregation of Revenue [Line Items]
Rental and other property	172,163	162,104	501,042	480,431
Rental and other property revenues | Operating Segments | Seattle Metro
Disaggregation of Revenue [Line Items]
Rental and other property	74,576	70,630	220,271	210,885
Rental and other property revenues | Other real estate assets
Disaggregation of Revenue [Line Items]
Rental and other property	$ 12,437	$ 11,525	$ 39,254	$ 39,130