Quarterly report pursuant to Section 13 or 15(d)

Organization (Details 2)

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Organization (Details 2) (Corporate Office Properties, L.P.)
9 Months Ended
Sep. 30, 2012
Trustee
Common Units
 
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 94.00%
Number of trustees controlling additional common units 3
Additional percentage of common units controlled by trustees (as a percent) 5.00%
Series H Preferred Units
 
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 100.00%
Series I Preferred Units
 
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 0.00%
Series J Preferred Units
 
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 100.00%
Series K Preferred Units
 
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 100.00%
Series L Preferred Units
 
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 100.00%