Annual report pursuant to Section 13 and 15(d)

Organization (Details)

v3.25.0.1
Organization (Details) - 12 months ended Dec. 31, 2024
ft² in Thousands
property
ft²
a
shares
Preferred units        
Investments in real estate        
Limited partners' capital account, units outstanding (in shares) | shares       0
COPT Defense Properties, L.P. | 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 195      
Area of real estate property (in sqft or acres) | ft²   22,400    
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 31      
Area of real estate property (in sqft or acres) | ft²   5,900    
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 4      
Area of real estate property (in sqft or acres) | ft²   606    
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 2      
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