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Revenues - Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) community	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Disaggregation of Revenue [Line Items]
Rental and other property	$ 379,216	$ 352,876
Management and other fees from affiliates	2,689	2,249
Revenues	$ 381,905	355,125
Occupancy threshold for classification as stabilized	90.00%
Apartment communities owned (in communities) \| community	253
Deferred revenue	$ 2,200		$ 2,400
Deferred revenue, revenue recognized	200
Deferred revenue balance from contracts with remaining performance obligations	2,200
Rental income
Disaggregation of Revenue [Line Items]
Rental and other property	373,425	347,305
Other property
Disaggregation of Revenue [Line Items]
Rental and other property	5,791	5,571
Rental and other property revenues
Disaggregation of Revenue [Line Items]
Rental and other property	379,216	352,876
Rental and other property revenues \| Same-property
Disaggregation of Revenue [Line Items]
Rental and other property	356,273	334,437
Rental and other property revenues \| Acquisitions
Disaggregation of Revenue [Line Items]
Rental and other property	1,747	0
Rental and other property revenues \| Development
Disaggregation of Revenue [Line Items]
Rental and other property	9,427	6,930
Rental and other property revenues \| Redevelopment
Disaggregation of Revenue [Line Items]
Rental and other property	1,435	1,632
Rental and other property revenues \| Non-residential/other, net
Disaggregation of Revenue [Line Items]
Rental and other property	$ 12,918	13,246
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	$ (2,584)	(3,369)
Rental and other property revenues \| Operating Segments \| Southern California
Disaggregation of Revenue [Line Items]
Rental and other property	156,969	141,969
Rental and other property revenues \| Operating Segments \| Northern California
Disaggregation of Revenue [Line Items]
Rental and other property	152,590	146,690
Rental and other property revenues \| Operating Segments \| Seattle Metro
Disaggregation of Revenue [Line Items]
Rental and other property	64,203	58,633
Rental and other property revenues \| Other real estate assets
Disaggregation of Revenue [Line Items]
Rental and other property	$ 5,454	$ 5,584