Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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ale Of Ownership Interest Percent in real estate property sold.

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Investments in Partially Owned Entities (Summary of Debt) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	May 31, 2016	Dec. 31, 2019	Apr. 18, 2019	Dec. 31, 2018
Partially Owned Office Buildings
Schedule of Equity Method Investments [Line Items]
Debt instrument, interest rate, effective percentage		3.68%
Maturity, range, start		2021
Maturity, range, end		2029
Equity method investment debt of partially owned entities		$ 3,604,104		$ 3,985,855
Alexanders Inc
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage		32.40%
Debt instrument, interest rate, effective percentage		2.98%
Maturity, range, start		2021
Maturity, range, end		2025
Equity method investment debt of partially owned entities		$ 974,836		1,170,544
Fifth Avenue and Times Square JV
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage		51.50%
Debt instrument, interest rate, effective percentage		3.31%
Maturity, range, start		2022
Maturity, range, end		2024
Equity method investment debt of partially owned entities		$ 950,000		0
Other equity method investments
Schedule of Equity Method Investments [Line Items]
Debt instrument, interest rate, effective percentage		4.36%
Maturity, range, start		2021
Maturity, range, end		2025
Equity method investment debt of partially owned entities		$ 1,290,227		4,564,489
7 West 34th Street
Schedule of Equity Method Investments [Line Items]
Mortgage loans on real estate, face amount of mortgages	$ 300,000
Sale of ownership interest percent	47.00%
640 Fifth Avenue
Schedule of Equity Method Investments [Line Items]
Mortgage loans on real estate, face amount of mortgages			$ 500,000
Partially Owned Properties
Schedule of Equity Method Investments [Line Items]
Equity method investment pro rata share debt of partially owned entities		$ 2,802,859		$ 2,682,865