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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 505,517 | $ 514,651 | $ 506,100
Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 25,174 | 19,607 | 23,346
Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 469,242 | 479,849 | 470,851
Rents | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (1,772) | (1,441) | (1,930)
Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 458,287 | 469,047 | 453,198
Total lease revenue | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (1,773) | (1,441) | (1,930)
Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 363,839 | 372,069 | 353,387
Fixed rent | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (1,631) | (1,895) | (1,895)
Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 94,448 | 96,978 | 99,811
Variable rent | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (142) | 454 | (35)
Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 919 | 1,291 | 2,582
Amortization of deferred market rents | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 | 0
Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 10,036 | 9,511 | 15,071
Daily parking & hotel flexible stay | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1 | 0 | 0
Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 23,742 | 24,417 | 24,132
Third party management fees, labor reimbursement and leasing | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 19,191 | 18,486 | 17,613
Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 12,533 | 10,385 | 11,117
Other income | Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 7,755 | 2,562 | 7,663
Philadelphia CBD | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 225,986 | 230,933 | 220,875
Philadelphia CBD | Rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 222,020 | 223,537 | 218,078
Philadelphia CBD | Total lease revenue | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 212,646 | 214,410 | 202,380
Philadelphia CBD | Fixed rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 158,382 | 159,732 | 151,034
Philadelphia CBD | Variable rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 54,264 | 54,678 | 51,346
Philadelphia CBD | Amortization of deferred market rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 647 | 649 | 1,308
Philadelphia CBD | Daily parking & hotel flexible stay | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 8,727 | 8,478 | 14,390
Philadelphia CBD | Third party management fees, labor reimbursement and leasing | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 158 | 405 | 287
Philadelphia CBD | Other income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 3,808 | 6,991 | 2,510
Pennsylvania Suburbs | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 125,011 | 129,300 | 128,940
Pennsylvania Suburbs | Rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 124,516 | 128,923 | 128,551
Pennsylvania Suburbs | Total lease revenue | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 124,516 | 128,923 | 128,541
Pennsylvania Suburbs | Fixed rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 114,056 | 118,856 | 116,926
Pennsylvania Suburbs | Variable rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 10,460 | 10,067 | 11,615
Pennsylvania Suburbs | Amortization of deferred market rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 | 10
Pennsylvania Suburbs | Daily parking & hotel flexible stay | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 | 0
Pennsylvania Suburbs | Third party management fees, labor reimbursement and leasing | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 21 | 38 | 35
Pennsylvania Suburbs | Other income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 474 | 339 | 354
Austin, Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 87,208 | 95,505 | 96,329
Austin, Texas | Rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 86,272 | 94,657 | 95,414
Austin, Texas | Total lease revenue | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 85,044 | 93,307 | 93,789
Austin, Texas | Fixed rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 56,620 | 63,209 | 60,831
Austin, Texas | Variable rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 28,424 | 30,098 | 32,958
Austin, Texas | Amortization of deferred market rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 272 | 642 | 1,264
Austin, Texas | Daily parking & hotel flexible stay | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 956 | 708 | 361
Austin, Texas | Third party management fees, labor reimbursement and leasing | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 603 | 516 | 486
Austin, Texas | Other income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 333 | 332 | 429
Other | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 42,138 | 39,306 | 36,610
Other | Rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 38,206 | 34,173 | 30,738
Other | Total lease revenue | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 37,854 | 33,848 | 30,418
Other | Fixed rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 36,412 | 32,167 | 26,491
Other | Variable rent | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,442 | 1,681 | 3,927
Other | Amortization of deferred market rents | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 | 0
Other | Daily parking & hotel flexible stay | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 352 | 325 | 320
Other | Third party management fees, labor reimbursement and leasing | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 3,769 | 4,972 | 5,711
Other | Other income | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 163 | $ 161 | $ 161

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