Quarterly report pursuant to Section 13 or 15(d)

Organization (Details 2)

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Organization (Details 2) (Corporate Office Properties, L.P.)
6 Months Ended
Jun. 30, 2013
Trustee
Common Units
 
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 95.80%
Number of trustees controlling additional common units 3
Additional percentage of common units controlled by trustees (as a percent) 3.50%
Preferred Units
 
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 96.40%