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Real Estate Joint Ventures (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010
Investments in real estate joint ventures |  |  |  |  |
Investment Balance | $ (5,841,000) |  | $ (5,841,000) |  | $ (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 |  |
Investment Balance | (5,841,000) |  | (5,841,000) |  | (5,545,000)
Ownership (as a percent) | 20.00% |  | 20.00% |  |
Number of buildings operated by the joint venture |  |  | 16 |  |
Maximum Exposure to Loss | 0 |  | 0 |  |
Difference between carrying amount of investment and share of the equity in the joint venture | 5,200,000 |  | 5,200,000 |  | 5,200,000
Condensed balance sheets for unconsolidated real estate joint venture |  |  |  |  |
Properties, net | 60,745,000 |  | 60,745,000 |  | 61,521,000
Other assets | 3,435,000 |  | 3,435,000 |  | 4,174,000
Total assets | 64,180,000 |  | 64,180,000 |  | 65,695,000
Liabilities (primarily debt) | 67,422,000 |  | 67,422,000 |  | 67,454,000
Owners' equity | (3,242,000) |  | (3,242,000) |  | (1,759,000)
Total liabilities and owners' equity | 64,180,000 |  | 64,180,000 |  | 65,695,000
Condensed statements of operations for unconsolidated real estate joint venture |  |  |  |  |
Revenues | 1,890,000 | 2,089,000 | 3,814,000 | 4,189,000 |
Property operating expenses | (979,000) | (832,000) | (1,965,000) | (1,826,000) |
Interest expense | (988,000) | (966,000) | (1,999,000) | (1,947,000) |
Depreciation and amortization expense | (567,000) | (857,000) | (1,175,000) | (1,735,000) |
Net loss | (644,000) | (566,000) | (1,325,000) | (1,319,000) |
Investments in consolidated real estate joint ventures |  |  |  |  |
Nature of Activity |  |  | Operates 16 buildings |  |
Consolidated real estate joint ventures |  |  |  |  |
Investments in consolidated real estate joint ventures |  |  |  |  |
Total Assets | 129,633,000 |  | 129,633,000 |  |
Pledged Assets | 77,448,000 |  | 77,448,000 |  |
Total Liabilities | 64,008,000 |  | 64,008,000 |  |
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 | 59,363,000 |  | 59,363,000 |  |
Pledged Assets | 48,749,000 |  | 48,749,000 |  |
Total Liabilities | 43,896,000 |  | 43,896,000 |  |
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 land parcel |  |
Total Assets | 30,065,000 |  | 30,065,000 |  |
Total Liabilities | 3,028,000 |  | 3,028,000 |  |
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 | 29,711,000 |  | 29,711,000 |  |
Pledged Assets | 28,699,000 |  | 28,699,000 |  |
Total Liabilities | 17,038,000 |  | 17,038,000 |  |
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 | 6,492,000 |  | 6,492,000 |  |
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 | 4,002,000 |  | 4,002,000 |  |
Total Liabilities | $ 46,000 |  | $ 46,000 |  |

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