Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the aggregate value of each identified investment accounted for under the equity method of accounting based on the quoted market price for those investments in common stock for which a quoted market price is available.

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Balance held at close of period in number of shares.

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The number of units in a real estate property owned as of the balance sheet date.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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No definition available.

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Equity Method Investment Fair Value In Excess Of Carrying Amount

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No definition available.

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This abstract relates to equity method investments and income from equity method investments

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Notes payable gross.

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Investments in Partially Owned Entities (Alexander's Inc.) (Details)	Sep. 14, 2020 USD ($)	Oct. 23, 2020 USD ($) apartment_unit	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 13, 2020 USD ($)
Alexanders Inc
Equity Method Investments And Income From Equity Method Investments
Ownership common shares, investee (in shares) \| shares			1,654,068
Equity method ownership percentage			32.40%
Closing share price (in dollars per share) \| $ / shares			$ 245.22
Equity method investment fair value			$ 405,611,000
Excess of investee's fair value over carrying amount			321,077,000
Excess of investee's carrying amount over equity in net assets			$ 38,511,000
Mortgages
Equity Method Investments And Income From Equity Method Investments
Interest rate, end of period (percent)			3.10%
Lexington Avenue Property \| Mortgages \| Retail \| Alexanders Inc
Equity Method Investments And Income From Equity Method Investments
Debt instrument, amount	$ 300,000,000			$ 350,000,000
Repayment of debt	$ 50,000,000
Spread over LIBOR (percent)	1.40%
Interest rate, end of period (percent)			1.56%
Subsequent Event \| The Alexander \| Mortgages \| Residential \| Alexanders Inc
Equity Method Investments And Income From Equity Method Investments
Notes payable gross		$ 94,000,000
Number of units \| apartment_unit		312
Debt instrument, interest rate, stated percentage (percent)		2.63%