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, 2013
Venture
Sep. 30, 2012
Sep. 30, 2013
Property
Venture
Sep. 30, 2012
Dec. 31, 2012
Investments in real estate joint ventures          
Investment Balance $ (6,420,000)   $ (6,420,000)   $ (6,420,000)
Corporate Office Properties, L.P.
          
Investments in real estate joint ventures          
Investment Balance (6,420,000)   (6,420,000)   (6,420,000)
Investments in consolidated real estate joint ventures          
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in dollars)     1,369,000    
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   1    
Investment Balance (6,420,000) [1]   (6,420,000) [1]   (6,420,000) [1]
Ownership (as a percent)     20.00%    
Number of buildings operated by the joint venture     16    
Maximum exposure to loss 0 [2]   0 [2]    
Difference between carrying amount of investment and share of the equity in the joint venture 3,000,000   3,000,000   4,500,000
Condensed balance sheets for unconsolidated real estate joint venture          
Properties, net 57,222,000   57,222,000   58,460,000
Other assets 6,248,000   6,248,000   4,376,000
Total assets 63,470,000   63,470,000   62,836,000
Liabilities (primarily debt) 80,424,000   80,424,000   72,693,000
Owners' equity (16,954,000)   (16,954,000)   (9,857,000)
Total liabilities and owners' equity 63,470,000   63,470,000   62,836,000
Condensed statements of operations for unconsolidated real estate joint venture          
Revenues 1,739,000 1,778,000 5,342,000 5,497,000  
Property operating expenses (755,000) (758,000) (2,250,000) (2,219,000)  
Interest expense (2,966,000) (1,138,000) (8,521,000) (3,291,000)  
Depreciation and amortization expense (575,000) (568,000) (1,668,000) (1,732,000)  
Net loss (2,557,000) (686,000) (7,097,000) (1,745,000)  
Consolidated real estate joint ventures
          
Investments in consolidated real estate joint ventures          
Total Assets 185,599,000 [3]   185,599,000 [3]    
Pledged Assets 93,063,000 [3]   93,063,000 [3]    
Total Liabilities 63,694,000 [3]   63,694,000 [3]    
LW Redstone Company, LLC
          
Investments in real estate joint ventures          
Ownership (as a percent)     85.00%    
Investments in consolidated real estate joint ventures          
Total Assets 114,141,000 [3],[4]   114,141,000 [3],[4]    
Pledged Assets 45,209,000 [3],[4]   45,209,000 [3],[4]    
Total Liabilities 22,141,000 [3],[4]   22,141,000 [3],[4]    
M Square Associates, LLC
          
Investments in real estate joint ventures          
Ownership (as a percent)     50.00%    
Number of buildings operated by the joint venture     2    
Investments in consolidated real estate joint ventures          
Total Assets 60,879,000 [3],[5]   60,879,000 [3],[5]    
Pledged Assets 47,854,000 [3],[5]   47,854,000 [3],[5]    
Total Liabilities 41,463,000 [3],[5]   41,463,000 [3],[5]    
COPT-FD Indian Head, LLC
          
Investments in real estate joint ventures          
Ownership (as a percent)     75.00%    
Investments in consolidated real estate joint ventures          
Total Assets 6,447,000 [3],[6]   6,447,000 [3],[6]    
MOR Forbes 2 LLC
          
Investments in real estate joint ventures          
Ownership (as a percent)     50.00%    
Number of buildings operated by the joint venture     1    
Investments in consolidated real estate joint ventures          
Total Assets 4,132,000 [3],[7]   4,132,000 [3],[7]    
Total Liabilities 90,000 [3],[7]   90,000 [3],[7]    
Common Shares | Corporate Office Properties, L.P.
          
Investments in consolidated real estate joint ventures          
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in units)     221,501    
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in dollars)     3,899,000    
Common Shares | Arundel Preserve LLC
          
Investments in consolidated real estate joint ventures          
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in units)     221,501    
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in dollars)     $ 5,200,000    
[1] The carrying amount of our investment in this joint venture was lower than our share of the equity in the joint venture by $3.0 million at September 30, 2013 and $4.5 million at December 31, 2012 due to our deferral of gain on the contribution by us of real estate into the joint venture upon its formation and our discontinuance of loss recognition under the equity method effective October 2012, as discussed below. A difference will continue to exist to the extent the nature of our continuing involvement in the joint venture remains the same and we continue to no longer recognize income or losses under the equity method.
[2] Derived from the sum of our investment balance and maximum additional unilateral capital contributions or loans required from us. Not reported above are additional amounts that we and our partner are required to fund when needed by this joint venture; these funding requirements are proportional to our respective ownership percentages. Also not reported above are additional unilateral contributions or loans from us, the amounts of which are uncertain, that we would be required to make if certain contingent events occur (see Note 17).
[3] Excludes amounts eliminated in consolidation.
[4] This joint venture’s property is in Huntsville, Alabama.
[5] This joint venture’s properties are in College Park, Maryland (in the Suburban Maryland region).
[6] This joint venture’s property is in Charles County, Maryland. In 2012, the joint venture exercised its option under a development agreement to require Charles County to repurchase the land parcel at its original acquisition cost. Under the terms of the agreement with Charles County, the repurchase is expected to occur by August 2014.
[7] This joint venture’s property is in Lanham, Maryland (in the Suburban Maryland region).