Quarterly report pursuant to Section 13 or 15(d)

Real Estate Joint Ventures - Narrative (Details)

v3.21.2
Real Estate Joint Ventures - Narrative (Details) - property
Jun. 30, 2021
Jun. 02, 2021
B RE COPT DC JV III LLC    
Real Estate [Line Items]    
Nominal Ownership % 10.00% 10.00%
Disposed of by sale | Data Center Shells in Northern Virginia    
Real Estate [Line Items]    
Ownership percentage sold   90.00%
Number of real estate properties sold   2