Revenues - Schedule of Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($) community	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) community	Jun. 30, 2024 USD ($)
Disaggregation of Revenue [Line Items]
Rental and other property	$ 467,610	$ 439,782	$ 929,699	$ 863,997
Management and other fees from affiliates	2,223	2,573	4,717	5,286
Revenues	$ 469,833	442,355	$ 934,416	869,283
Apartment communities owned (in communities) | community	259		259
Operating Segments | Southern California
Disaggregation of Revenue [Line Items]
Rental and other property	$ 189,744	179,488	$ 378,366	348,378
Operating Segments | Northern California
Disaggregation of Revenue [Line Items]
Rental and other property	191,026	164,083	373,209	324,523
Operating Segments | Seattle Metro
Disaggregation of Revenue [Line Items]
Rental and other property	78,297	73,782	155,511	145,695
Other real estate assets
Disaggregation of Revenue [Line Items]
Rental and other property	8,543	22,429	22,613	45,401
Rental income
Disaggregation of Revenue [Line Items]
Rental and other property	460,686	432,141	916,546	849,377
Other property
Disaggregation of Revenue [Line Items]
Rental and other property	6,924	7,641	13,153	14,620
Rental and other property revenues
Disaggregation of Revenue [Line Items]
Rental and other property	467,610	439,782	929,699	863,997
Rental and other property revenues | Same-property
Disaggregation of Revenue [Line Items]
Rental and other property	$ 410,948	398,293	$ 817,934	791,661
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	$ 41,784	12,824	$ 76,554	14,422
Rental and other property revenues | Non-residential/other, net
Disaggregation of Revenue [Line Items]
Rental and other property	$ 14,711	29,176	$ 35,432	58,488
Apartment communities owned (in communities) | community	2		2
Rental and other property revenues | Straight line rent concession
Disaggregation of Revenue [Line Items]
Straight line rent concession	$ 167	(511)	$ (221)	(574)
Rental and other property revenues | Operating Segments | Southern California
Disaggregation of Revenue [Line Items]
Rental and other property	189,744	179,488	378,366	348,378
Rental and other property revenues | Operating Segments | Northern California
Disaggregation of Revenue [Line Items]
Rental and other property	191,026	164,083	373,209	324,523
Rental and other property revenues | Operating Segments | Seattle Metro
Disaggregation of Revenue [Line Items]
Rental and other property	78,297	73,782	155,511	145,695
Rental and other property revenues | Other real estate assets
Disaggregation of Revenue [Line Items]
Rental and other property	$ 8,543	$ 22,429	$ 22,613	$ 45,401