Quarterly report pursuant to Section 13 or 15(d)

Real Estate Joint Ventures (Details)

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Real Estate Joint Ventures (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2012
building
venture
Mar. 31, 2011
Dec. 31, 2011
building
Investments in real estate joint ventures      
Investment Balance $ (6,178,000)   $ (6,071,000)
Unconsolidated real estate joint ventures
     
Investments in real estate joint ventures      
Number of unconsolidated real estate joint ventures in which the entity has an interest 1    
Investment Balance (6,178,000)   (6,071,000)
Ownership (as a percent) 20.00%   20.00%
Number of buildings operated by the joint venture 16   16
Maximum exposure to loss 0    
Difference between carrying amount of investment and share of the equity in the joint venture 5,200,000   5,200,000
Condensed balance sheets for unconsolidated real estate joint venture      
Properties, net 59,333,000   59,792,000
Other assets 4,403,000   3,529,000
Total assets 63,736,000   63,321,000
Liabilities (primarily debt) 68,663,000   67,710,000
Owners' equity (4,927,000)   (4,389,000)
Total liabilities and owners' equity 63,736,000   63,321,000
Condensed statements of operations for unconsolidated real estate joint venture      
Revenues 1,894,000 1,924,000  
Property operating expenses (737,000) (986,000)  
Interest expense (1,125,000) (1,011,000)  
Depreciation and amortization expense (570,000) (608,000)  
Net loss (538,000) (681,000)  
M Square Associates, LLC
     
Investments in real estate joint ventures      
Number of buildings operated by the joint venture 2    
Investments in consolidated real estate joint ventures      
Ownership (as a percent) 50.00%    
Total Assets 60,260,000    
Pledged Assets 47,845,000    
Total Liabilities 44,117,000    
LW Redstone Company, LLC
     
Investments in consolidated real estate joint ventures      
Ownership (as a percent) 85.00%    
Total Assets 55,255,000    
Pledged Assets 15,858,000    
Total Liabilities 11,373,000    
Arundel Preserve 5, LLC
     
Investments in real estate joint ventures      
Number of buildings operated by the joint venture 1    
Investments in consolidated real estate joint ventures      
Ownership (as a percent) 50.00%    
Total Assets 32,477,000    
Pledged Assets 31,619,000    
Total Liabilities 18,079,000    
COPT-FD Indian Head, LLC
     
Investments in consolidated real estate joint ventures      
Ownership (as a percent) 75.00%    
Total Assets 6,544,000    
MOR Forbes 2 LLC
     
Investments in real estate joint ventures      
Number of buildings operated by the joint venture 1    
Investments in consolidated real estate joint ventures      
Ownership (as a percent) 50.00%    
Total Assets 3,836,000    
Total Liabilities 40,000    
Consolidated real estate joint ventures
     
Investments in consolidated real estate joint ventures      
Total Assets 158,372,000    
Pledged Assets 95,322,000    
Total Liabilities $ 73,609,000