Quarterly report pursuant to Section 13 or 15(d)

Organization - Narrative 2 (Details)

v3.21.2
Organization - Narrative 2 (Details) - Corporate Office Properties, L.P.
 9 Months Ended
Sep. 30, 2021
shares
Preferred Units  
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Limited partners' capital account, units outstanding (in units) 0
COPT | Common Units  
Forms of ownership in Operating Partnership and ownership percentage by the entity  
Percentage ownership in operating partnership 98.30%