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REAL ESTATE INVESTMENTS - Schedule of Office Properties Sold (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |
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Dec. 20, 2024 USD ($) a | Nov. 18, 2024 USD ($) ft² | Sep. 30, 2024 USD ($) a | Sep. 26, 2024 USD ($) ft² | Dec. 27, 2023 USD ($) a | Dec. 07, 2023 USD ($) a | Dec. 01, 2023 USD ($) ft² | Oct. 31, 2023 USD ($) ft² | Aug. 04, 2023 USD ($) ft² | Nov. 22, 2022 USD ($) ft² | Sep. 30, 2022 USD ($) | Jul. 29, 2022 USD ($) a | Jul. 14, 2022 USD ($) a ft² | Jun. 28, 2022 USD ($) | Apr. 14, 2022 USD ($) a | Jan. 20, 2022 USD ($) a | Dec. 31, 2024 USD ($) ft² | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 30, 2023 ft² | Jun. 28, 2022 ft² | Jun. 28, 2022 a
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,297 | $ 7,736 | $ 17,677 |  |  |
Provision for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 44,655 | $ 131,573 | 4,663 |  |  |
Area of real estate property | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,098,843 |  |  |  |  |
Recognized a provision for impairment |  |  |  |  |  |  | $ 16,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plymouth Meeting Executive Center | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller financing amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,500 |  |  |  |  |
55 US Avenue | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller financing amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,400 |  |  |  |  |
55 US Avenue and One and Two Barton Skyway | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,100 |  |  |  |  |
Land | 55 US Avenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  | $ 6,466 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land | Dabney East |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  |  | 11.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  | $ 1,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  | $ 430 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land | Byberry |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  |  |  | 50.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  | $ 9,641 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  | $ 3,960 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land | 11501 Burnett Road |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  |  |  |  |  |  |  |  |  | 4.7 |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  | $ 32,513 |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  | $ 8,340 |  |  |  |  |  |  |  |  |  |
Land | 25 M Street |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.8 |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,675 |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  |  |  |  | $ 400 |  |  |  | $ 3,836 |  |  |  |  |  |  |
Land | Gateway G & H |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.0 |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600 |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 897 |  |  |  |  |  |
Land | Gibbsboro Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 700 |  |  |
Land | 3151 Market Street |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of real estate property | ft² |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |
Land | 11501 Burnet Road |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  |  |  |  |  |  |  |  |  | 4.7 |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  | $ 32,500 |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  | $ 8,300 |  |  |  |  |  |  |  |  |  |
Office Properties | Plymouth Meeting Executive Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet/Acres | ft² |  |  |  | 521,288 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  | $ 65,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | One and Two Barton Skyway |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet/Acres | ft² |  | 390,963 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  | $ 107,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | 8521 Leesburg Pike |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet/Acres | ft² |  |  |  |  |  |  | 150,897 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  | $ 11,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | Three Barton Skyway |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet/Acres | ft² |  |  |  |  |  |  |  |  | 173,302 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  | $ 53,250 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | 200 Barr Harbor Drive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet/Acres | ft² |  |  |  |  |  |  |  |  |  | 86,000 |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  | $ 30,500 |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  |  |  | $ 8,740 |  |  |  |  |  |  |  |  |  |  |  |
Office Properties | Gibbsboro Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |
Retail | 200 N. Radnor Chester Road |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet/Acres | ft² |  |  |  |  |  |  |  | 17,884 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  | $ 14,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  | $ 7,735 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leasehold Interest | 3151 Market Street |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a |  |  |  |  |  |  |  |  |  |  |  |  | 0.8 |  |  |  |  |  |  |  |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,394 |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  | 2,583 |  |  |  |  |  |  |  |  |
Leasehold Interest | 3151 Market Street |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rentable Square Feet/Acres | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  | 30,400 |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,600 |  |  |  |  |  |  |  |  |
Lease agreement term (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 99 years |  |  |  |  |  |  |  |  |
Office/Land | Gibbsboro Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,809 | 4.0
Sales Price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,100 |  |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 831 |  |  |  |  |  |  |  |
Parking Lot | Dabney Land Westwood |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land area | a | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales Price | $ 8,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain/(Loss) on Sale | $ 2,297 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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