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 9 Months Ended
Sep. 30, 2011
entity
Sep. 30, 2010
Sep. 30, 2011
property
entity
Sep. 30, 2010
Dec. 31, 2010
Investments in real estate joint ventures          
Investment Balance $ (5,953,000)   $ (5,953,000)   $ (5,545,000)
Unconsolidated real estate joint ventures
          
Investments in real estate joint ventures          
Number of unconsolidated real estate joint ventures the entity has an interest in 1   1    
Ownership (as a percent) 20.00%   20.00%    
Number of buildings operated by the joint venture     16    
Difference between carrying amount of investment and share of the equity in the joint venture 5,200,000   5,200,000   5,200,000
Maximum Exposure to Loss 0   0    
Condensed balance sheets for unconsolidated real estate joint venture          
Properties, net 60,332,000   60,332,000   61,521,000
Other assets 3,645,000   3,645,000   4,174,000
Total assets 63,977,000   63,977,000   65,695,000
Liabilities (primarily debt) 67,780,000   67,780,000   67,454,000
Owners' equity (3,803,000)   (3,803,000)   (1,759,000)
Total liabilities and owners' equity 63,977,000   63,977,000   65,695,000
Condensed statements of operations for unconsolidated real estate joint venture          
Revenues 1,905,000 2,094,000 5,719,000 6,283,000  
Property operating expenses (904,000) (902,000) (2,869,000) (2,728,000)  
Interest expense (984,000) (899,000) (2,983,000) (2,846,000)  
Depreciation and amortization expense (578,000) (826,000) (1,753,000) (2,561,000)  
Net loss (561,000) (533,000) (1,886,000) (1,852,000)  
Consolidated real estate joint ventures
          
Investments in consolidated real estate joint ventures          
Total Assets 139,108,000   139,108,000    
Pledged Assets 77,025,000   77,025,000    
Total Liabilities 64,140,000   64,140,000    
M Square Associates, LLC, Date Acquired 6/26/2007
          
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%    
Nature of Activity     Operating two buildings and developing others    
Total Assets 60,190,000   60,190,000    
Pledged Assets 48,435,000   48,435,000    
Total Liabilities 44,735,000   44,735,000    
LW Redstone Company, LLC, Date Acquired 3/23/2010
          
Investments in consolidated real estate joint ventures          
Ownership (as a percent)     85.00%    
Nature of Activity     Developing business park    
Total Assets 38,854,000   38,854,000    
Total Liabilities 2,453,000   2,453,000    
Arundel Preserve 5, LLC, Date Acquired 7/2/2007
          
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%    
Nature of Activity     Operating one building    
Total Assets 29,552,000   29,552,000    
Pledged Assets 28,590,000   28,590,000    
Total Liabilities 16,908,000   16,908,000    
COPT-FD Indian Head, LLC, Date Acquired 10/23/2006
          
Investments in consolidated real estate joint ventures          
Ownership (as a percent)     75.00%    
Nature of Activity     Developing land parcel    
Total Assets 6,524,000   6,524,000    
MOR Forbes 2 LLC, Date Acquired 12/24/2002
          
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%    
Nature of Activity     Operating one building    
Total Assets 3,988,000   3,988,000    
Total Liabilities $ 44,000   $ 44,000