Area of a real estate property.

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

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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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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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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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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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No definition available.

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The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The aggregate cost of investments for Federal income tax purposes.

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Debt Instrument, Extension Term

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Debt Instrument Maturity Date in YYYY-MM format.

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The total number of term extensions available to the borrower

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Investments in Partially Owned Entities (330 Madison Avenue, 280 Park Avenue and Toys R Us) (Details) ft² in Thousands				1 Months Ended
	Aug. 23, 2017 USD ($) ft² myExtension	Jul. 19, 2017 USD ($) ft²	Jul. 17, 2017	Jul. 19, 2017 USD ($) ft²	Sep. 30, 2017 USD ($)
Office \| 330 Madison Avenue
Schedule Of Equity Method Investments
Equity method ownership percentage		25.00%		25.00%
Net proceeds from debt		$ 85,000,000
Proceeds from (repayments of) debt		$ 150,000,000
Office \| 280 Park Avenue
Schedule Of Equity Method Investments
Equity method ownership percentage	50.00%
Net proceeds from debt	$ 140,000,000
Proceeds from (repayments of) debt	900,000,000
330 Madison Avenue Joint Venture \| Office \| 330 Madison Avenue
Schedule Of Equity Method Investments
Square footage of real estate property \| ft²		845		845
330 Madison Avenue Joint Venture \| Loans due August 2024 \| Office \| 330 Madison Avenue
Schedule Of Equity Method Investments
Loans payable		$ 500,000,000		$ 500,000,000
Debt term		7 years
Debt instrument maturity				2024-08
Debt instrument, interest rate, stated percentage		3.43%		3.43%
280 Park Avenue Joint Venture \| Loans due September 2019 \| Office \| 280 Park Avenue
Schedule Of Equity Method Investments
Loans payable	$ 1,200,000,000.0
Square footage of real estate property \| ft²	1,250
Interest rate, effective					2.97%
Number of loan extensions available \| myExtension	5
Length of extension available	1 year
Mortgages
Schedule Of Equity Method Investments
Interest rate, effective					3.47%
LIBOR
Schedule Of Equity Method Investments
Spread Over LIBOR (in percentage)			1.25%
LIBOR \| 280 Park Avenue Joint Venture \| Loans due September 2019 \| Office \| 280 Park Avenue
Schedule Of Equity Method Investments
Spread Over LIBOR (in percentage)	1.73%
LIBOR \| Mortgages \| 330 Madison Avenue Joint Venture \| Loans due August 2024 \| Office \| 330 Madison Avenue
Schedule Of Equity Method Investments
Spread Over LIBOR (in percentage)		1.30%
LIBOR \| Mortgages \| 280 Park Avenue Joint Venture \| Loans due September 2019 \| Office \| 280 Park Avenue
Schedule Of Equity Method Investments
Spread Over LIBOR (in percentage)	2.00%
Toys R Us
Schedule Of Equity Method Investments
Equity method ownership percentage					32.50%
Equity method investment, carrying amount					$ 0
Tax basis of investments, cost for income tax purposes					$ 420,000,000