Investments In Unconsolidated Joint Ventures (Mack-Green-Gale LLC/Gramercy Agreement) (Details) (USD $)
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0 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 0 Months Ended | |||||||||||||||
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Oct. 18, 2012
Gramercy Agreement [Member]
item
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Dec. 17, 2010
Gramercy Agreement [Member]
sqft
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Apr. 29, 2009
Gramercy Agreement [Member]
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Sep. 30, 2012
Gramercy Agreement [Member]
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Sep. 30, 2011
Gramercy Agreement [Member]
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Mar. 31, 2010
Gramercy Agreement [Member]
sqft
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Sep. 30, 2012
Gramercy Agreement [Member]
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Sep. 30, 2011
Gramercy Agreement [Member]
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Dec. 31, 2008
Gramercy Agreement [Member]
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Mar. 31, 2009
Gramercy Agreement [Member]
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May 09, 2006
Mack-Green [Member]
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Sep. 30, 2012
Mack-Green [Member]
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Apr. 29, 2009
Mack-Green [Member]
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Sep. 30, 2012
SL Green [Member]
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Sep. 30, 2012
OPLP [Member]
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Mar. 31, 2009
OPLP [Member]
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Dec. 31, 2007
OPLP [Member]
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May 09, 2006
OPLP [Member]
property
sqft
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May 09, 2006
OPLP [Member]
Mack-Green [Member]
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Sep. 30, 2012
Ten Operating Partnerships [Member]
Mack-Green [Member]
property
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Sep. 30, 2012
Ten Operating Partnerships [Member]
SL Green [Member]
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Sep. 30, 2012
Eight Operating Partnerships [Member]
Mack-Green [Member]
property
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Sep. 30, 2012
Eight Operating Partnerships [Member]
SL Green [Member]
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May 09, 2006
New Jersey [Member]
OPLP [Member]
property
sqft
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May 09, 2006
Michigan [Member]
OPLP [Member]
property
sqft
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Schedule of Equity Method Investments [Line Items] | |||||||||||||||||||||||||
Percentage of interest in venture | 100.00% | 100.00% | 96.00% | ||||||||||||||||||||||
Acquisition cost | $ 125,000,000 | ||||||||||||||||||||||||
Mortgage loans, carrying amount | 90,300,000 | 276,300,000 | |||||||||||||||||||||||
Mortgage finance on property obtained | 11,000,000 | ||||||||||||||||||||||||
Number of properties | 6 | 4 | 10 | 8 | |||||||||||||||||||||
Mortgage loan, maturity date | May 2009 | May 2016 | |||||||||||||||||||||||
Area of office property sold, square feet | 198,376 | 121,314 | 1,200,000 | ||||||||||||||||||||||
Area of office property, square feet | 3,500,000 | 2,300,000 | |||||||||||||||||||||||
Spread over LIBOR | 2.75% | 2.75% | |||||||||||||||||||||||
Interest rate cap | 3.15% | ||||||||||||||||||||||||
Period in advance of agreement end date that fair market value estimates are to be provided | 6 months | ||||||||||||||||||||||||
Venture sale of real estate | 13,900,000 | 83,500,000 | |||||||||||||||||||||||
Management, leasing and other services fees | 117,000 | 108,000 | 354,000 | 382,000 | |||||||||||||||||||||
Number of deeds transferred | 4 | ||||||||||||||||||||||||
Mortgage loans on real estate bearing weighted average fixed interest rate | 185,000,000 | ||||||||||||||||||||||||
Weighted average fixed interest rate | 6.26% | ||||||||||||||||||||||||
Repayments of debt | 26,800,000 | ||||||||||||||||||||||||
Number of owned office properties | 25 | 17 | |||||||||||||||||||||||
Number of properties sold | 1 | 8 | |||||||||||||||||||||||
Venture gain (loss) on sale of real estate | (22,300,000) | ||||||||||||||||||||||||
Profit sharing percentage | 50.00% | 50.00% | 99.00% | 1.00% | 99.00% | ||||||||||||||||||||
Impairment charge on property | $ 32,300,000 | ||||||||||||||||||||||||
Sharing percent of amount realized | 50.00% | ||||||||||||||||||||||||
Holding and distribution pattern under operating agreement | The Mack-Green operating agreement generally provided for profits and losses to be allocated as follows: 99 percent of Mack-Green's share of the profits and losses from 10 specific OPLP Properties allocable to the Company and one percent allocable to SL Green; (ii) one percent of Mack-Green's share of the profits and losses from eight specific OPLP Properties and its minor interest in four office properties allocable to the Company and 99 percent allocable to SL Green; and (iii) 50 percent of all other profits and losses allocable to the Company and 50 percent allocable to SL Green. |