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Organization (Details 2) - Corporate Office Properties, L.P. [Member]
12 Months Ended
Dec. 31, 2015
Common Units [Member]  
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 96.30%
Preferred Units [Member]  
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 95.50%