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Area of land held.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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Impairment (Details)	3 Months Ended					9 Months Ended		12 Months Ended
Impairment (Details)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) ft² a building	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) hotel_room	Mar. 31, 2020 USD ($) ft²	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Real Estate [Line Items]
Impairment of real estate	$ 0		$ 0			$ 13,068,000	$ 48,738,000
Carrying value	6,865,357,000					6,865,357,000		$ 6,685,069,000
Impairment of investment in real estate and other affiliates	$ 0					$ 0
Condominium Inventory
Real Estate [Line Items]
Other asset impairment charge								$ 6,000,000
Mr. C Seaport
Real Estate [Line Items]
Impairment of investment in real estate and other affiliates				$ 6,000,000
Equity method investment, ownership percentage				35.00%
Equity method investment, proceeds from sale				$ 800,000
Minimum
Real Estate [Line Items]
Assumed lease-up period		24 months
Maximum
Real Estate [Line Items]
Assumed lease-up period		48 months
Fair Value, Measurements, Nonrecurring \| Valuation, Income Approach \| Measurement Input, Cap Rate
Real Estate [Line Items]
Fair value capitalization rate		0.0875
Fair Value, Measurements, Nonrecurring \| Discounted cash flow analysis \| Measurement Input, Cap Rate
Real Estate [Line Items]
Fair value capitalization rate					0.10			0.100
Equity Method Investments
Real Estate [Line Items]
Number of buildings \| building		17
Equity Method Investments \| Mr. C Seaport
Real Estate [Line Items]
Number of hotel rooms \| hotel_room				66
Century Park
Real Estate [Line Items]
Impairment of real estate		$ 13,100,000
Area of land \| a		63
Area of real estate property (in sqft) \| ft²		1,300,000
Outlet Collection At Riverwalk
Real Estate [Line Items]
Impairment of real estate					$ 48,700,000
Area of real estate property (in sqft) \| ft²					273,270
Carrying value					$ 46,800,000