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REAL ESTATE INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2023
Real Estate [Abstract] |
Schedule of Gross Carrying Value of Operating Properties | As of December 31, 2023 and 2022, the gross carrying value of the operating properties was as follows (in thousands):
| December 31, 2023 |  | December 31, 2022
Land | $ | 394,669 |  |  | $ | 403,998 |
Building and improvements | 2,671,024 |  |  | 2,760,357 |
Tenant improvements | 476,539 |  |  | 452,885 |
Total | $ | 3,542,232 |  |  | $ | 3,617,240 |
Schedule of Capitalized Construction Costs | The following table shows the amount of compensation costs (including bonuses and benefits) capitalized for the years presented (in thousands):
| December 31,
| 2023 |  | 2022 |  | 2021
Development | $ | 4,096 |  |  | $ | 5,343 |  |  | $ | 4,815 |
Redevelopment | 944 |  |  | 1,484 |  |  | 1,170 |
Tenant Improvements | 3,817 |  |  | 2,505 |  |  | 1,917 |
Total | $ | 8,857 |  |  | $ | 9,332 |  |  | $ | 7,902 |
Schedule of Acquired Properties |
Property/Portfolio Name |  | Acquisition Date |  | Location |  | Property Type |  | Rentable Square Feet/Acres |  | Purchase Price
165 King of Prussia Road |  | October 27, 2023 |  | Radnor, PA |  | Land |  | 1.1 acres |  | $ | 8,550 |
Property/Portfolio Name |  | Acquisition Date |  | Location |  | Property Type |  | Rentable Square Feet/Acres |  | Purchase Price
631 Park Avenue |  | January 21, 2022 |  | King of Prussia, PA |  | Land |  | 3.3 acres |  | $ | 3,650 |
3151 Market Street (a) |  | April 29, 2022 |  | Philadelphia, PA |  | Leasehold Interest |  | 0.8 acres |  | $ | 27,349 |
(a)On April 29, 2022, the Company acquired, through a 99-year ground lease, the leasehold interest in a 0.8-acre land parcel, located at 3151 Market Street, in Philadelphia, Pennsylvania. The Company prepaid $19.5 million of the ground lease, representing 500,000 square feet of buildable floor to area ratio (“FAR”) to be used for the development of 3151 Market Street, and paid $7.8 million for 200,000 square feet of FAR density usable pursuant to the Schuylkill Yards Project master development agreement. The additional density is included in prepaid leasehold interests in land held for development in the consolidated balance sheets. See below regarding disposition of 500,000 square feet of FAR.
Schedule of Office Properties Sold | The following table summarizes the property dispositions during the years ended December 31, 2023, 2022 and 2021 (dollars in thousands):
Property/Portfolio Name |  | Disposition Date |  | Location |  | Property Type |  | Rentable Square Feet/Acres |  | Sales Price |  | Gain/(Loss) on Sale (a)
Dabney East |  | December 27, 2023 |  | Richmond, VA |  | Land |  | 11.6 acres |  | $ | 1,600 |  |  | $ | 430 |
Byberry |  | December 7, 2023 |  | Philadelphia, PA |  | Land Purchase Option |  | 50.0 acres |  | $ | 9,641 |  |  | $ | 3,960 |
8521 Leesburg Pike (f) |  | December 1, 2023 |  | Vienna, VA |  | Office |  | 150,897 |  |  | $ | 11,000 |  |  | $ | — |
200 N. Radnor Chester Road |  | October 31, 2023 |  | Radnor, PA |  | Retail |  | 17,884 |  |  | $ | 14,200 |  |  | $ | 7,735 |
Three Barton Skyway (f) |  | August 4, 2023 |  | Austin, TX |  | Office |  | 173,302 |  |  | $ | 53,250 |  |  | $ | — |
200 Barr Harbor Drive |  | November 22, 2022 |  | West Conshohocken, PA |  | Office |  | 86,000 |  |  | $ | 30,500 |  |  | $ | 8,740 |
11501 Burnett Road (d) |  | July 29, 2022 |  | Austin, TX |  | Land |  | 4.7 acres |  | $ | 32,513 |  |  | $ | 8,340 |
3151 Market Street (c) |  | July 14, 2022 |  | Philadelphia, PA |  | Leasehold Interest |  | 0.8 acres |  | $ | 30,394 |  |  | $ | 2,583 |
Gibbsboro Portfolio (b) |  | June 28, 2022 |  | Gibbsboro, NJ |  | Office/Land |  | 42,809/4.0 acres |  | $ | 4,100 |  |  | $ | 831 |
25 M Street (e) |  | April 14, 2022 |  | Washington, D.C. |  | Land |  | 0.8 acres |  | $ | 29,675 |  |  | $ | 3,836 |
Gateway G & H |  | January 20, 2022 |  | Richmond, VA |  | Land |  | 10.0 acres |  | $ | 1,600 |  |  | $ | 897 |
1100 Lenox Drive |  | September 8, 2021 |  | Lawrenceville, NJ |  | Land |  | 5.0 acres |  | $ | 2,575 |  |  | $ | 68 |
2100-2200 Lenox Drive |  | July 6, 2021 |  | Lawrenceville, NJ |  | Land |  | 35.2 acres |  | $ | 8,900 |  |  | $ | 842 |
3025 JFK Boulevard |  | February 2, 2021 |  | Philadelphia, PA |  | Leasehold Interest |  | 1.0 acres |  | $ | 34,800 |  |  | $ | 2,000 |
(a)Gain/(Loss) on Sale is net of closing and other transaction related costs. (b)Includes $0.7 million of gain on sale of undepreciated real estate and $0.1 million of gain on disposition of real estate included within the consolidated statements of operations for the twelve months ended December 31, 2022. (c)On July 14, 2022, the Company contributed 500,000 square feet of FAR relating to its 99-year prepaid leasehold interest at 3151 Market Street in Philadelphia, Pennsylvania, acquired on April 29, 2022, to a newly formed joint venture with an unaffiliated third party. The Company's initial deemed contribution in the project was $30.4 million and the transaction resulted in deconsolidation of the property and conversion of Brandywine 3151 Market, LP, (formerly a wholly-owned subsidiary of the Operating Partnership) to a real estate venture (“3151 Market Street Venture”). The Company recorded its investment at fair value and recognized a gain, net of transaction costs, of $2.6 million, in “Net gain on sale of undepreciated real estate” on the consolidated statements of operations. See Note 4, “Investment in Unconsolidated Real Estate Ventures,” for further information. (d)On July 29, 2022, the Company contributed a 4.7 acre parcel of land held for development at 11501 Burnet Road in Austin, Texas to a newly formed joint venture with an unaffiliated third party. The project is part of the Uptown ATX master development. The Company's combined contributed initial land investment in the project was $32.5 million and the transaction resulted in the deconsolidation of the property and formation of Brandywine Uptown Office LLC and Brandywine One Uptown Multifamily LLC, (together, “One Uptown Ventures)”). The Company recorded its investment at fair value and recognized a gain of $8.3 million in “Net gain on disposition of real estate” on the consolidated statements of operations. Gain on sale of $8.3 million is calculated as the difference between the estimated relative sales value of the contributed land and the estimated total cost allocations per block. See Note 4, “Investment in Unconsolidated Real Estate Ventures,” for further information. (e)On September 30, 2022, the Company recognized $0.4 million of additional gain on disposition of real estate. (f)Recognized a provision for impairment of $16.7 million on the property prior to the sales.

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