Annual report pursuant to Section 13 and 15(d)

Real Estate Joint Ventures (Details)

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Real Estate Joint Ventures (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Investments in real estate joint ventures      
Investment Balance $ (6,420,000) $ (6,071,000)  
Condensed statements of operations for unconsolidated real estate joint venture      
Gain (loss) on early extinguishment of debt 0 2,452,000 6,406,000
Investments in consolidated real estate joint ventures      
Amounts advanced to fund Huntsville infrastructure costs 33,396,000 27,998,000  
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 (6,420,000) [1] (6,071,000) [1]  
Ownership (as a percent) 20.00%    
Number of buildings operated by the joint venture 16    
Maximum exposure to loss 0 [2]    
Difference between carrying amount of investment and share of the equity in the joint venture 4,500,000 5,200,000  
Condensed balance sheets for unconsolidated real estate joint venture      
Properties, net 58,460,000 59,792,000  
Other assets 4,376,000 3,529,000  
Total assets 62,836,000 63,321,000  
Liabilities (primarily debt) 72,693,000 67,710,000  
Owners' equity (9,857,000) (4,389,000)  
Total liabilities and owners' equity 62,836,000 63,321,000  
Condensed statements of operations for unconsolidated real estate joint venture      
Revenues 7,316,000 7,577,000 8,405,000
Property operating expenses (2,829,000) (3,673,000) (3,600,000)
Interest expense (7,672,000) (3,913,000) (3,937,000)
Depreciation and amortization expense (2,283,000) (2,463,000) (3,154,000)
Net loss (5,468,000) (2,472,000) (2,286,000)
LW Redstone Company, LLC
      
Investments in real estate joint ventures      
Ownership (as a percent) 85.00% [3]    
Investments in consolidated real estate joint ventures      
Total Assets 76,295,000 [3],[4]    
Pledged Assets 16,809,000 [3],[4]    
Total Liabilities 12,990,000 [3],[4]    
Percentage of residual distributable cash flows in excess of upaid cumulative preferred returns and return of invested capital entitled to the company 85.00%    
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the entity's partners 15.00%    
Number of years following construction commencement threshold achievement before partner's interest can be purchased at fair value 5 years    
Construction commencement threshold (in square feet) 4,400,000    
Amounts advanced to fund Huntsville infrastructure costs 33,300,000    
Capital account credited to partner upon formation of joint venture 9,000,000    
M Square Associates, LLC
      
Investments in real estate joint ventures      
Ownership (as a percent) 50.00% [5]    
Number of buildings operated by the joint venture 2    
Investments in consolidated real estate joint ventures      
Total Assets 60,798,000 [4],[5]    
Pledged Assets 47,360,000 [4],[5]    
Total Liabilities 43,149,000 [4],[5]    
Percentage of residual amounts distributed to each member 50.00%    
Arundel Preserve 5, LLC
      
Investments in real estate joint ventures      
Ownership (as a percent) 50.00% [6]    
Number of buildings operated by the joint venture 1    
Investments in consolidated real estate joint ventures      
Total Assets 39,581,000 [4],[6]    
Pledged Assets 36,811,000 [4],[6]    
Total Liabilities 17,722,000 [4],[6]    
COPT-FD Indian Head, LLC
      
Investments in real estate joint ventures      
Ownership (as a percent) 75.00% [7]    
Investments in consolidated real estate joint ventures      
Total Assets 6,436,000 [4],[7]    
Total Liabilities 16,000 [4],[7]    
MOR Forbes 2 LLC
      
Investments in real estate joint ventures      
Ownership (as a percent) 50.00% [8]    
Number of buildings operated by the joint venture 1    
Investments in consolidated real estate joint ventures      
Total Assets 3,879,000 [4],[8]    
Total Liabilities 96,000 [4],[8]    
Consolidated real estate joint ventures
      
Investments in consolidated real estate joint ventures      
Total Assets 186,989,000 [4]    
Pledged Assets 100,980,000 [4]    
Total Liabilities 73,973,000 [4]    
Maximum | LW Redstone Company, LLC
      
Investments in consolidated real estate joint ventures      
Infrastructure costs anticipated to be funded by entity for reimbursement by the City of Huntsville (in dollars) $ 76,000,000    
[1] The carrying amount of our investment in this joint venture was lower than our share of the equity in the joint venture by $4.5 million at December 31, 2012 and $5.2 million at December 31, 2011 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 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.
[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 20).
[3] This joint venture’s property is in Huntsville, Alabama.
[4] Excludes amounts eliminated in consolidation.
[5] This joint venture’s properties are in College Park, Maryland (in the Suburban Maryland region).
[6] This joint venture’s property is in Hanover, Maryland (in the Baltimore/Washington Corridor).
[7] 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.
[8] This joint venture’s property is in Lanham, Maryland (in the Suburban Maryland region).