Quarterly report pursuant to Section 13 or 15(d)

Real Estate Joint Ventures (Details)

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Real Estate Joint Ventures (Details) (USD $)
9 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2014
Consolidated real estate joint ventures
Sep. 30, 2014
LW Redstone Company, LLC
buillding
Sep. 30, 2014
LW Redstone Company, LLC
Variable Interest Entity, Primary Beneficiary [Member]
Sep. 30, 2014
M Square Associates, LLC
buillding
Sep. 30, 2014
M Square Associates, LLC
Variable Interest Entity, Primary Beneficiary [Member]
Aug. 07, 2014
COPT-FD Indian Head, LLC
Variable Interest Entity, Primary Beneficiary [Member]
Investments in consolidated real estate joint ventures            
Ownership (as a percent)     85.00%   50.00%  
Total Assets $ 199,429,000 [1]   $ 139,314,000 [1],[2]   $ 60,115,000 [1],[3]  
Encumbered Assets 114,915,000 [1]   67,100,000 [1],[2]   47,815,000 [1],[3]  
Total Liabilities 81,944,000 [1]   42,134,000 [1],[2]   39,810,000 [1],[3]  
Buildings Operated by Joint Ventures Number   4 [2]   2 [3]    
Proceeds from the repurchase of real estate           $ 6,400,000
[1] Excludes amounts eliminated in consolidation.
[2] This joint venture’s property is in Huntsville, Alabama.
[3] This joint venture’s properties are in College Park, Maryland (in the Baltimore/Washington Corridor).