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Real Estate Disposition Activities (Details) ft² in Thousands	3 Months Ended		15 Months Ended
	Mar. 31, 2021 USD ($) residential_condominium home ft² community	Mar. 31, 2020 USD ($)	Mar. 31, 2021 USD ($) residential_condominium ft² community	Dec. 31, 2020 USD ($)
Summary of income from discontinued operations
Gains (Losses) on Sales of Investment Real Estate	$ 53,727,000	$ 24,436,000
Number Of Communities Held For Sale \| community	1		1
Number of Residential Condominium Units Sold \| residential_condominium	10		80
Gain (Loss) on Sale of Other Investments	$ 131,000	4,903,000
Other Selling, General and Administrative Expense	1,044,000	$ 1,443,000
For-sale condominium inventory	$ 253,859,000		$ 253,859,000	$ 267,219,000
Number of Residential Condominiums Remaining to be Sold \| residential_condominium	92		92
eaves Stamford
Summary of income from discontinued operations
Number Of Apartment Homes Sold \| home	238
Proceeds from Sale of Real Estate	$ 72,000,000
Gains (Losses) on Sales of Investment Real Estate	53,775,000
The Park Loggia [Member]
Summary of income from discontinued operations
Proceeds from Sale of Real Estate	$ 14,609,000
Number Of Residential Condominium Units \| residential_condominium	172		172
Commercial Square Feet \| ft²	66		66
Gain (Loss) on Sale of Other Investments	$ 131,000