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ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP - Narrative (Details) | 12 Months Ended
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Dec. 31, 2023 a ft² parcel property managementCompany
Organization of The Parent Company and The Operating Partnership [Line Items] |
Number of real estate properties | property | 72
Rentable square feet | 13,011,094
Number of management companies | managementCompany | 7
Leashold Interest Land |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Lease agreement term (in years) | 99 years
Unconsolidated Properties | Unconsolidated Real Estate Ventures |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Number of real estate properties | property | 12
Parent Company |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Rentable square feet | 12,100,000
Areas of land held for development (in acres) | a | 141.6
Lease agreement term (in years) | 99 years
Area of additional undeveloped parcels of land with option to purchase | a | 5.1
Parent Company | Parcel of land |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Lease agreement term (in years) | 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
Number of parcels of land | parcel | 1
Wholly-owned Management Company Subsidiaries |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Rentable square feet | 22,400,000
Wholly-owned Management Company Subsidiaries | Wholly Owned Properties |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Rentable square feet | 13,000,000
Wholly-owned Management Company Subsidiaries | Partially Owned Properties |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Rentable square feet | 9,400,000
Brandywine Operating Partnership LP |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Ownership in the operating partnership | 99.70%
BRSCO | BRANDYWINE OPERATING PARTNERSHIP, L.P. | Brandywine Operating Partnership LP |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Ownership in the operating partnership | 100.00%
BMI | BRANDYWINE OPERATING PARTNERSHIP, L.P. | Brandywine Operating Partnership LP |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Ownership in the operating partnership | 100.00%
BPI | BRANDYWINE OPERATING PARTNERSHIP, L.P. | Brandywine Operating Partnership LP |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Ownership in the operating partnership | 100.00%
BBL | BRANDYWINE OPERATING PARTNERSHIP, L.P. | Brandywine Operating Partnership LP |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Ownership in the operating partnership | 100.00%
BPM | BRANDYWINE OPERATING PARTNERSHIP, L.P. | Brandywine Operating Partnership LP |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Ownership in the operating partnership | 100.00%
BBS | BRANDYWINE OPERATING PARTNERSHIP, L.P. | Brandywine Operating Partnership LP |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Ownership in the operating partnership | 100.00%
BGCS | BRANDYWINE OPERATING PARTNERSHIP, L.P. | Brandywine Operating Partnership LP |
Organization of The Parent Company and The Operating Partnership [Line Items] |
Ownership in the operating partnership | 100.00%

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