Annual report pursuant to Section 13 and 15(d)

Investments In Unconsolidated Joint Ventures (GE/Gale Funding LLC (Princeton Forrestal Village)) (Details)

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Investments In Unconsolidated Joint Ventures (GE/Gale Funding LLC (Princeton Forrestal Village)) (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2011
PFV [Member]
Dec. 31, 2010
PFV [Member]
Dec. 31, 2009
PFV [Member]
Dec. 16, 2010
PFV [Member]
May 09, 2006
PFV [Member]
sqft
May 09, 2006
GE Gale [Member]
Schedule of Equity Method Investments [Line Items]            
Percentage of interest in venture           10.00%
Area of office property         527,015  
Venture sale of real estate       $ 55,000,000    
Management, leasing and other services fees 87,000 1,400,000 1,100,000      
Acquisition cost           1,800,000
Share of gain on sale of real estate   41,000        
Venture gain (loss) on sale of real estate       $ 207,000