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REAL ESTATE INVESTMENTS - Schedule of Office Properties Sold (Details) $ in Thousands																12 Months Ended
	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	Sep. 08, 2021 USD ($) ft²	Jul. 06, 2021 USD ($) ft²	Feb. 02, 2021 USD ($) a	Dec. 31, 2023 USD ($) ft²	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	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																$ 7,736	$ 17,677	$ 142
Area of real estate property | ft²																13,011,094
Recognized a provision for impairment																$ 16,700
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 | 1100 Lenox Drive
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Land area | ft²													5.0
Sales Price													$ 2,575
Gain/(Loss) on Sale													$ 68
Land | 2100-2200 Lenox Drive
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Land area | ft²														35.2
Sales Price														$ 8,900
Gain/(Loss) on Sale														$ 842
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 | 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 | 3025 JFK Boulevard
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Land area | a															1.0
Sales Price															$ 34,800
Gain/(Loss) on Sale															$ 2,000
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

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