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Mortgage Notes Payable - Footnotes (Details) - USD ($)				9 Months Ended
	Sep. 15, 2021	Mar. 25, 2021	Jan. 22, 2021	Sep. 30, 2021	Apr. 14, 2021	Dec. 31, 2020
Mortgage loans payable on real estate
Unamortized deferred finance costs				$ 13,640,000		$ 14,085,000
Freehold Raceway Mall
Mortgage loans payable on real estate
Percentage of loan assumed by third party				49.90%
Chandler Fashion Center
Mortgage loans payable on real estate
Percentage of loan assumed by third party				49.90%
Danbury Fair Mall
Mortgage loans payable on real estate
Repayments of debt	$ 10,000
Green Acres Commons
Mortgage loans payable on real estate
Extension term		2 years
Repayments of debt		$ 4,680,000
Green Acres Commons | LIBOR
Mortgage loans payable on real estate
Variable rate		2.75%
Green Acres Commons - Swapped | Swaps
Mortgage loans payable on real estate
Outstanding balance to fixed rate				$ 95,000,000
Green Acres Mall
Mortgage loans payable on real estate
Extension term			1 year
Repayments of debt			$ 9,000,000
Santa Monica Place | Swaps
Mortgage loans payable on real estate
Outstanding balance to fixed rate				$ 300,000,000	$ 300,000,000

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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