Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Mack-Green-Gale LLC/Gramercy Agreement) (Details)

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Investments In Unconsolidated Joint Ventures (Mack-Green-Gale LLC/Gramercy Agreement) (Details) (USD $)
 3 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2009
OPLP [Member]
Dec. 31, 2007
OPLP [Member]
Sep. 30, 2010
OPLP [Member]
May 09, 2006
OPLP [Member]
sqft
May 09, 2006
OPLP [Member]
Mack-Green [Member]
Apr. 29, 2009
Gramercy Agreement [Member]
May 09, 2006
Gramercy Agreement [Member]
Sep. 30, 2011
Gramercy Agreement [Member]
Sep. 30, 2010
Gramercy Agreement [Member]
Mar. 31, 2010
Gramercy Agreement [Member]
sqft
Mar. 31, 2009
Gramercy Agreement [Member]
Sep. 30, 2011
Gramercy Agreement [Member]
Sep. 30, 2010
Gramercy Agreement [Member]
Dec. 17, 2010
Gramercy Agreement [Member]
sqft
Dec. 31, 2008
Gramercy Agreement [Member]
May 09, 2006
Mack-Green [Member]
Apr. 29, 2009
Mack-Green [Member]
Percentage of interest in venture     96.00% 100.00% 96.00%                       100.00%
Mortgage loans, carrying amount $ 276,300,000                   $ 90,300,000            
Mortgage finance on property obtained                           11,000,000      
Number of properties                     6            
Mortgage loan maturity date May 2016                   May 2009            
Area of office property       3,500,000                          
Area of office property                   121,314       198,376      
Spread over LIBOR           275         275            
Interest rate cap           3.15%                      
Venture sale of real estate   83,500,000               13,900,000              
Management, leasing and other services fees               108,000 223,000     382,000 690,000        
Acquisition cost                               125,000,000  
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                          
Number of properties sold   8               1              
Venture gain (loss) on sale of real estate   (22,300,000)                              
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:

(i)

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.