Long Term Debt, Fixed Rate Debt and Floating Rate Debt, Total

No definition available.

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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

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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-Section S99

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-Subparagraph (SX 210.5-02.22)

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-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

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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

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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-Section 55

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 210

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-Subparagraph (SX 210.5-02.22)

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-Name Accounting Standards Codification

-Topic 942

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-Subparagraph (SX 210.9-03.16)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 16

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 20, 22

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-Section S99

-Paragraph 1

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+ Details

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

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- Definition

The cash outflow for cost incurred in the modification of term of existing debt agreement in order for the entity to achieve some advantage.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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Debt Schedule of Long term Debt (Details) (USD $)	0 Months Ended		12 Months Ended
Debt Schedule of Long term Debt (Details) (USD $)	Nov. 05, 2014	Feb. 01, 2014	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total			903,985,000us-gaap_LongTermDebt	$ 883,112,000us-gaap_LongTermDebt
Mortgages [Member]
Debt Instrument [Line Items]
Fixed rate debt			746,916,000	824,088,000
Floating rate debt			135,146,000	47,331,000
Total mortgage debt			882,062,000	871,419,000
Total principal			1,602,062,000	1,196,419,000
Unamortized premiums, net of unamortized discount			9,590,000	11,693,000
Total			1,611,652,000	1,208,112,000
Mortgages [Member] \| 10 Union Square [Member]
Debt Instrument [Line Items]
Fixed rate debt			20,641,000	20,972,000
Stated Rate			6.00%
Effective Rate			6.77%
Mortgages [Member] \| 10 Bank Street [Member]
Debt Instrument [Line Items]
Fixed rate debt			32,847,000	33,444,000
Stated Rate			5.72%
Effective Rate			6.21%
Mortgages [Member] \| 1542 Third Avenue [Member]
Debt Instrument [Line Items]
Fixed rate debt			18,628,000	19,011,000
Stated Rate			5.90%
Effective Rate			6.60%
Mortgages [Member] \| First Stamford Place [Member]
Debt Instrument [Line Items]
Fixed rate debt			242,294,000	245,629,000
Stated Rate			5.65%
Effective Rate			6.15%
Mortgages [Member] \| 383 Main Avenue [Member]
Debt Instrument [Line Items]
Fixed rate debt			29,852,000	30,403,000
Stated Rate			5.59%
Effective Rate			6.09%
Mortgages [Member] \| 1010 Third Avenue and 77 West 55th Street [Member]
Debt Instrument [Line Items]
Fixed rate debt			27,595,000	28,096,000
Stated Rate			5.69%
Effective Rate			6.20%
Mortgages [Member] \| 1333 Broadway [Member]
Debt Instrument [Line Items]
Fixed rate debt			69,575,000	70,447,000
Stated Rate			6.32%
Effective Rate			3.82%
Mortgages [Member] \| 1400 Broadway - First Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt			69,689,000	0
Stated Rate			6.12%
Effective Rate			3.80%
Mortgages [Member] \| 1400 Broadway - Second Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt			9,803,000	0
Stated Rate			3.35%
Effective Rate			1.00%
Mortgages [Member] \| 112 West 34th Street - First Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt			77,484,000	0
Stated Rate			6.01%
Effective Rate			3.45%
Mortgages [Member] \| 112 West 34th Street - Second Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt			9,763,000	0
Stated Rate			6.56%
Effective Rate			4.01%
Mortgages [Member] \| 1350 Broadway - First Lien Mortgage Loan [Member]
Debt Instrument [Line Items]
Fixed rate debt			38,900,000	39,420,000
Stated Rate			5.87%
Effective Rate			3.60%
Mortgages [Member] \| Metro Center [Member]
Debt Instrument [Line Items]
Fixed rate debt			99,845,000	96,158,000
Stated Rate			3.59%
Effective Rate			3.66%
Payments for Fees	2,800,000
Mortgages [Member] \| One Grand Central Place - First Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt			0	71,723,000
Mortgages [Member] \| One Grand Central Place - Second Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt			0	14,884,000
Mortgages [Member] \| 500 Mamaroneck Avenue [Member]
Debt Instrument [Line Items]
Fixed rate debt			0	32,620,000
Mortgages [Member] \| 250 West 57th Street - First Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt			0	25,621,000
Mortgages [Member] \| 250 West 57th Street - Second Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt			0	11,252,000
Mortgages [Member] \| 501 Seventh Avenue - Note 1 [Member]
Debt Instrument [Line Items]
Fixed rate debt			0	1,037,000
Mortgages [Member] \| 501 Seventh Avenue - Note 2 - Tranche 1 [Member]
Debt Instrument [Line Items]
Fixed rate debt			0	31,459,000
Mortgages [Member] \| 501 Seventh Avenue - Note 2 - Tranche 2 [Member]
Debt Instrument [Line Items]
Fixed rate debt			0	6,889,000
Mortgages [Member] \| 1359 Broadway - First Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt			0	9,579,000
Mortgages [Member] \| 1359 Broadway - Second Lien - Tranche 1 [Member]
Debt Instrument [Line Items]
Fixed rate debt			0	5,561,000
Mortgages [Member] \| 1359 Broadway - Second Lien - Tranche 2 [Member]
Debt Instrument [Line Items]
Fixed rate debt			0	11,311,000
Mortgages [Member] \| 1359 Broadway - Second Lien - Tranche 3 [Member]
Debt Instrument [Line Items]
Fixed rate debt			0	18,572,000
Mortgages [Member] \| Fixed Rate Debt, 1359 Broadway [Member]
Debt Instrument [Line Items]
Floating rate debt			44,146,000	0
Mortgages [Member] \| Fixed Rate Debt, 1359 Broadway [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Interest rate at end of period			1.92%
Mortgages [Member] \| One Grand Central Place [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.35%
Interest rate at end of period			1.52%
Mortgages [Member] \| One Grand Central Place [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Floating rate debt			91,000,000	0
Mortgages [Member] \| One Grand Central Place - Third Lien [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Floating rate debt			0	6,382,000
Mortgages [Member] \| 250 West 57th Street - Third lien [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Floating rate debt			0	21,000,000
Mortgages [Member] \| 501 Seventh Avenue - Third Lien [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Floating rate debt			0	6,540,000
Mortgages [Member] \| 1350 Broadway - 2nd Lien Mortgage Loan [Member]
Debt Instrument [Line Items]
Floating rate debt			0	13,409,000
Mortgages [Member] \| Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Floating rate debt			170,000,000	25,000,000
Mortgages [Member] \| Secured Revolving Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.20%
Interest rate at end of period			1.37%
Mortgages [Member] \| Secured Term Credit Facility [Member]
Debt Instrument [Line Items]
Floating rate debt			300,000,000	300,000,000
Mortgages [Member] \| Secured Term Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			1.35%
Interest rate at end of period			1.52%
Mortgages [Member] \| Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Fixed rate debt			250,000,000	$ 0
Stated Rate			2.625%
Effective Rate			3.95%
Interest Rate Fix Option 1 [Member] \| Mortgages [Member] \| 250 West 57th Street - Third lien [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			3.00%
Interest Rate Fix Option 2 [Member] \| Mortgages [Member] \| 250 West 57th Street - Third lien [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			3.00%