Annual report pursuant to Section 13 and 15(d)

Organization (Details)

v3.24.0.1
Organization (Details) - 12 months ended Dec. 31, 2023
ft² in Thousands
property
ft²
a
shares
CDPLP | Preferred units        
Investments in real estate        
Limited partners' capital account, units outstanding (in shares) | shares       0
CDPLP | COPT Defense Properties | Common Units        
Investments in real estate        
Percentage ownership in operating partnership 97.80%      
Operating Properties | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 190      
Area of real estate property (in sqft or acres) | ft²   21,700    
Operating Properties | Other | Greater Washington, DC/Baltimore        
Investments in real estate        
Number of real estate properties 8      
Area of real estate property (in sqft or acres) | ft²   2,100    
Operating Properties | Office properties | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 160      
Area of real estate property (in sqft or acres) | ft²   16,000    
Operating Properties | Single-tenant data centers | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 30      
Area of real estate property (in sqft or acres) | ft²   5,700    
Properties Under Development | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 5      
Area of real estate property (in sqft or acres) | ft²   817    
Properties Under Development | Office properties | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 2      
Properties Under Development | Single-tenant data centers | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 3      
Land controlled for development | Defense/IT Portfolio        
Investments in real estate        
Area of real estate property (in sqft or acres)   7,900 660  
Land controlled for development | Other | Greater Washington, DC/Baltimore        
Investments in real estate        
Area of real estate property (in sqft or acres) | a     50  
Unconsolidated real estate joint ventures        
Investments in real estate        
Number of real estate properties 24      
Unconsolidated real estate joint ventures | Operating Properties | Single-tenant data centers | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 24