Real Estate Disposition Activities (Details) ft² in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023 USD ($) community residential_condominium ft² home	Jun. 30, 2023 USD ($) home	Sep. 30, 2022 USD ($) residential_condominium	Sep. 30, 2023 USD ($) community residential_condominium ft²	Sep. 30, 2022 USD ($) residential_condominium	Dec. 31, 2022 USD ($)
Summary of income from discontinued operations
Gain on sale of communities	$ 22,121		$ 318,289	$ 209,430	$ 467,493
Number of communities held for sale | community	1			1
Number of residential condominium units sold | residential_condominium			10	4	38
Other selling, general and administrative expense	$ (27)		$ 340	$ 272	$ 1,644
Number of residential condominiums remaining to be sold | residential_condominium	4			4
Aggregate carrying value of real estate	$ 12,657			$ 12,657		$ 32,532
eaves Daly City
Summary of income from discontinued operations
Number of apartment homes sold | home		195
Proceeds from sale of real estate		$ 67,000
Gain on sale of communities		$ 54,618
Avalon at Newton Highlands
Summary of income from discontinued operations
Number of apartment homes sold | home		294
Proceeds from sale of real estate		$ 170,000
Gain on sale of communities		$ 132,723
Avalon Columbia Pike
Summary of income from discontinued operations
Number of apartment homes sold | home	269
Proceeds from sale of real estate	$ 105,000
Gain on sale of communities	$ 22,345
Square feet of commercial space | ft²	27			27
The Park Loggia
Summary of income from discontinued operations
Proceeds from sale of real estate			38,991	$ 19,397	120,328
Square feet of commercial space | ft²	66			66
Number of residential condominium units | residential_condominium	172			172
Gain on for-sale condominiums			$ 644	$ 461	$ 2,113