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SEGMENT INFORMATION - Schedule of Real Estate Investments, at Cost of Company's Reportable Segments (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Operating properties	$ 3,265,410	$ 3,374,780
Right of use asset - operating leases, net	17,957	18,412
Construction-in-progress	94,635	94,628
Land held for development	73,395	81,318
Prepaid leasehold interests in land held for development, net	27,762	27,762
Continuing Operations
Segment Reporting Information [Line Items]
Operating properties	3,265,410	3,374,780
Total Core Segments | Continuing Operations
Segment Reporting Information [Line Items]
Operating properties	2,984,443	3,097,025
Philadelphia CBD | Continuing Operations
Segment Reporting Information [Line Items]
Operating properties	1,585,703	1,556,696
Pennsylvania Suburbs | Continuing Operations
Segment Reporting Information [Line Items]
Operating properties	885,079	869,179
Austin, Texas | Continuing Operations
Segment Reporting Information [Line Items]
Operating properties	513,661	671,150
Other | Continuing Operations
Segment Reporting Information [Line Items]
Operating properties	$ 280,967	$ 277,755

X

- Definition

The current amount of expenditures for a real estate project that has not yet been completed.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(d))
-Publisher FASB
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Carrying amount of land available for development.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
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-Name Accounting Standards Codification
-Section S99
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Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
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Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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