Quarterly report pursuant to Section 13 or 15(d)

Organization (Details)

v3.24.3
Organization (Details) - 9 months ended Sep. 30, 2024
ft² in Thousands
property
ft²
a
shares
COPT Defense Properties | Preferred Units        
Investments in real estate        
Limited partners' capital account, units outstanding (in units) | shares       0
COPT Defense Properties, L.P. | COPT Defense Properties | Common Units | COPT Defense Properties        
Investments in real estate        
Percentage ownership in operating partnership 97.50%      
Unconsolidated Real Estate Joint Ventures        
Investments in real estate        
Number of real estate properties 24      
Operating Properties | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 194      
Area of real estate property (in sqft or acres) | ft²   22,200    
Operating Properties | Greater Washington, DC/Baltimore | Other        
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 164      
Area of real estate property (in sqft or acres) | ft²   16,500    
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    
Operating Properties | Single-tenant data centers | Unconsolidated Real Estate Joint Ventures | Defense/IT Portfolio        
Investments in real estate        
Number of real estate properties 24      
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   831    
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)   11,000 1,020  
Land controlled for development | Greater Washington, DC/Baltimore | Other        
Investments in real estate        
Area of real estate property (in sqft or acres) | a     50