Annual report pursuant to Section 13 and 15(d)

Organization (Details 2)

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Organization (Details 2) (Corporate Office Properties, L.P.)
12 Months Ended
Dec. 31, 2013
Trustee
Common Units
 
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 95.60%
Number of trustees controlling additional common units 3
Additional percentage of common units controlled by trustees (as a percent) 3.40%
Preferred Units
 
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 96.40%