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Organization of The Parent Company and The Operating Partnership (Textual) (Details)
 12 Months Ended
Dec. 31, 2018
ft²
a
property
Parcel
Organization of The Parent Company and The Operating Partnership [Line Items]  
Number of Properties | property 97
Net Rentable Square Feet 16,777,249
Land Parcel One [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Lease agreement term 99 years
Land Parcel Two [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Lease agreement term 99 years
Parent Company  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Undeveloped Parcels of Land | a 237.4
Undeveloped Land Held for Sale | a 37.9
Area of Additional Undeveloped Parcels of Land With Option to Purchase | a 55.5
Total Potential Development Capacity 14,300,000
Parent Company | Land Parcel One [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Lease agreement term 99 years
Parent Company | Land Parcel Two [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Lease agreement term 99 years
Parent Company | Held for Sale Properties Included in Continuing Operations [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Total Potential Development Capacity 400,000
Wholly-owned Management Company Subsidiaries [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Net Rentable Square Feet 24,800,000
Wholly-owned Management Company Subsidiaries [Member] | Wholly Owned Properties [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Net Rentable Square Feet 16,800,000
Wholly-owned Management Company Subsidiaries [Member] | Partially Owned Properties [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Net Rentable Square Feet 8,000,000.0
Development Property [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Number of Properties | property 1
Redevelopment Properties [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Number of Properties | property 3
Leashold Interest Land [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Number of Parcels | Parcel 2
Leashold Interest Land [Member] | Parent Company  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Number of Parcels | Parcel 2
Undeveloped Parcels of Land Held | a 1.8
Brandywine Operating Partnership LP [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Ownership in the Operating Partnership 99.40%
BRSCO [Member] | Subsidiaries [Member] | Brandywine Operating Partnership LP [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Ownership in the Operating Partnership 100.00%
BMH [Member] | Subsidiaries [Member] | Brandywine Operating Partnership LP [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Ownership in the Operating Partnership 100.00%
BPI [Member] | Subsidiaries [Member] | Brandywine Operating Partnership LP [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Ownership in the Operating Partnership 100.00%
BBL [Member] | Subsidiaries [Member] | Brandywine Operating Partnership LP [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Ownership in the Operating Partnership 100.00%
BPM [Member] | Subsidiaries [Member] | Brandywine Operating Partnership LP [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Ownership in the Operating Partnership 100.00%
BBS [Member] | Subsidiaries [Member] | Brandywine Operating Partnership LP [Member]  
Organization of The Parent Company and The Operating Partnership [Line Items]  
Ownership in the Operating Partnership 100.00%