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ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP - Narrative (Details)
 9 Months Ended
Sep. 30, 2026
ft²
a
property
Organization of The Parent Company and The Operating Partnership [Line Items]  
Number of real estate properties | property 59
Area of real estate property (in square feet) 11,096,451
Unconsolidated Properties | Unconsolidated Real Estate Ventures  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Number of real estate properties | property 6
Parent Company  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Area of real estate property (in square feet) 11,600,000
Areas of land held for development (in acres) | a 106.5
Lease agreement term 99 years
Area of additional undeveloped parcels of land with option to purchase (in acres) | a 5.1
Parent Company | Parcel of land  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Lease agreement term 99 years
Parent Company | Leashold Interest Land  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Areas of land held for development (in acres) | a 0.8
Wholly-owned Management Company Subsidiaries  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Area of real estate property (in square feet) 18,100,000
Wholly-owned Management Company Subsidiaries | Wholly Owned Properties  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Area of real estate property (in square feet) 11,300,000
Wholly-owned Management Company Subsidiaries | Partially Owned Properties  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Area of real estate property (in square feet) 6,800,000
Brandywine Operating Partnership, L.P.  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Ownership in the operating partnership 99.70%