Area of a real estate property.

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- Definition

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

+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Section 45
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- Definition

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

+ References

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- Definition

The amount of liabilities reported by an equity method investment of the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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- Definition

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

+ References

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- Definition

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.

+ References

No definition available.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 10
-Section F

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- Definition

The term of the extension available, in years

+ References

No definition available.

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- Definition

The total number of term extensions available to the borrower

+ References

No definition available.

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Investments in Partially Owned Entities (One Park, NY Mezzanine Loan) (Details) ft² in Thousands	Mar. 17, 2016 USD ($) Extensions	Mar. 07, 2016 USD ($) ft²	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable			$ 9,746,818,000	$ 9,513,713,000
One Park Avenue [Member] \| Joint Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage		55.00%
One Park Avenue [Member] \| Joint Venture [Member] \| Office Building [Member]
Schedule Of Equity Method Investments [Line Items]
Square Footage Of Real Estate Property \| ft²		947
One Park Avenue [Member] \| Joint Venture [Member] \| Mortgage loan at 4.995% Matures 2016 [Member]
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable		$ 250,000,000
Interest Rate, End of Period (in percentage)		4.995%
One Park Avenue [Member] \| Joint Venture [Member] \| Mortgage Loan at 2.19% Maturing March 2021 [Member]
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable		$ 300,000,000
Interest Rate, End of Period (in percentage)			2.21%
One Park Avenue [Member] \| Joint Venture [Member] \| Mortgage Loan at 2.19% Maturing March 2021 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Schedule Of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)		1.75%
Mezzanine Loan New York [Member] \| Vornado Realty Trust [Member]
Schedule Of Equity Method Investments [Line Items]
Our share of remaining commitment			$ 2,650,000
Mezzanine Loan New York [Member] \| Joint Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	33.30%
Notes And Loans Payable	$ 142,050,000
Remaining committment			7,950,000
Subordinated Debt			$ 350,000,000
Mezzanine Loan New York [Member] \| Joint Venture [Member] \| Mezzanine Loan Maturing November 2016 [Member]
Schedule Of Equity Method Investments [Line Items]
Number Of Extensions Available \| Extensions	2
Length Of Extension Available	3 months
Interest Rate, End of Period (in percentage)			9.32%
Mezzanine Loan New York [Member] \| Joint Venture [Member] \| Mezzanine Loan Maturing November 2016 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Schedule Of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)	8.875%