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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 506,100 | $ 486,819 | $ 534,852
Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 470,851 | 451,519 | 513,504
Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 453,198 | 433,766 | 497,264
Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 353,387 | 343,924 | 393,178
Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 99,811 | 89,842 | 104,086
Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 2,582 | 5,377 | 4,868
Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 15,071 | 12,376 | 11,372
Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 24,132 | 26,444 | 18,580
Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 11,117 | 8,856 | 2,768
Philadelphia CBD |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 220,875 | 207,858 | 232,028
Philadelphia CBD | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 218,078 | 204,848 | 229,619
Philadelphia CBD | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 202,380 | 191,026 | 217,696
Philadelphia CBD | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 151,034 | 149,441 | 166,286
Philadelphia CBD | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 51,346 | 41,585 | 51,410
Philadelphia CBD | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,308 | 2,064 | 1,146
Philadelphia CBD | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 14,390 | 11,758 | 10,777
Philadelphia CBD | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 287 | 893 | 927
Philadelphia CBD | Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 2,510 | 2,117 | 1,482
Pennsylvania Suburbs |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 128,940 | 124,566 | 141,613
Pennsylvania Suburbs | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 128,551 | 124,256 | 141,162
Pennsylvania Suburbs | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 128,541 | 124,106 | 140,995
Pennsylvania Suburbs | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 116,926 | 113,748 | 128,044
Pennsylvania Suburbs | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 11,615 | 10,358 | 12,951
Pennsylvania Suburbs | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 10 | (9) | (12)
Pennsylvania Suburbs | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 159 | 179
Pennsylvania Suburbs | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 35 | 34 | 39
Pennsylvania Suburbs | Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 354 | 276 | 412
Austin, Texas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 96,329 | 101,680 | 102,982
Austin, Texas | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 95,414 | 100,826 | 102,069
Austin, Texas | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 93,789 | 97,395 | 98,489
Austin, Texas | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 60,831 | 62,545 | 63,366
Austin, Texas | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 32,958 | 34,850 | 35,123
Austin, Texas | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,264 | 3,322 | 3,531
Austin, Texas | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 361 | 109 | 49
Austin, Texas | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 486 | 452 | 689
Austin, Texas | Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 429 | 402 | 224
Metropolitan Washington, D.C. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 21,899 | 19,865 | 40,223
Metropolitan Washington, D.C. | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 18,053 | 13,173 | 33,509
Metropolitan Washington, D.C. | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 17,969 | 13,056 | 33,374
Metropolitan Washington, D.C. | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 16,686 | 12,410 | 29,830
Metropolitan Washington, D.C. | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,283 | 646 | 3,544
Metropolitan Washington, D.C. | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 | 0
Metropolitan Washington, D.C. | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 84 | 117 | 135
Metropolitan Washington, D.C. | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 3,723 | 6,548 | 6,541
Metropolitan Washington, D.C. | Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 123 | 144 | 173
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 14,711 | 14,015 | 13,469
Other | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 12,685 | 10,913 | 10,900
Other | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 12,449 | 10,680 | 10,465
Other | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 9,805 | 8,020 | 8,064
Other | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 2,644 | 2,660 | 2,401
Other | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 | 203
Other | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 236 | 233 | 232
Other | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 1,988 | 3,077 | 2,560
Other | Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 38 | 25 | 9
Corporate |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 23,346 | 18,835 | 4,537
Corporate | Rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (1,930) | (2,497) | (3,755)
Corporate | Total lease revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (1,930) | (2,497) | (3,755)
Corporate | Fixed rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (1,895) | (2,240) | (2,412)
Corporate | Variable rent |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | (35) | (257) | (1,343)
Corporate | Amortization of deferred market rents |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 | 0
Corporate | Daily parking & hotel flexible stay |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 0 | 0 | 0
Corporate | Third party management fees, labor reimbursement and leasing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 17,613 | 15,440 | 7,824
Corporate | Other income |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 7,663 | $ 5,892 | $ 468

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