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DEBT OBLIGATIONS - Schedule of Consolidated Debt Obligations Outstanding (Details) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |
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Jun. 23, 2026 USD ($) | May 28, 2026 extension | Apr. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Mar. 31, 2026 | Jun. 30, 2026 USD ($) extension | Jun. 24, 2026 USD ($) | Jun. 22, 2026 USD ($) | Dec. 31, 2025 USD ($) | Jan. 16, 2024 | Nov. 23, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 2,624,934,000 |  |  |  |  |
Plus: original issue premium (discount), net |  |  |  |  |  |  | 6,825,000 |  |  |  |  |
Less: deferred financing costs |  |  |  |  |  |  | (14,753,000) |  |  |  |  |
Debt, net |  |  |  |  |  |  | 2,617,006,000 |  |  | $ 2,556,862,000 |  |
Fixed rate debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | 144,260,000 |  |  | 234,079,000 |  |
Less: deferred financing costs |  |  |  |  |  |  | (3,064,000) |  |  | (1,259,000) |  |
Fixed rate debt | 3151 Market Street |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 50,500,000 |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  | 7.31% |  |
Additional future funding for new leasing |  |  |  |  |  |  |  |  |  | $ 30,000,000.0 |  |
Prepaid interest |  |  |  |  |  |  |  |  |  | 3,300,000 |  |
Unsecured term loans, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | 2,477,610,000 |  |  | 2,328,610,000 |  |
Plus: original issue premium (discount), net |  |  |  |  |  |  | 6,825,000 |  |  | 7,760,000 |  |
Less: deferred financing costs |  |  |  |  |  |  | (11,689,000) |  |  | (13,587,000) |  |
Debt, net |  |  |  |  |  |  | 2,472,746,000 |  |  | 2,322,783,000 |  |
3025 JFK Construction Loan | Fixed rate debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 250,000,000.0 |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 0 |  |  | 178,014,000 |  |
Debt retired | $ 178,000,000 |  |  |  |  |  |  |  |  |  |  |
Number of extensions | extension |  |  |  |  |  |  | 2 |  |  |  |  |
Extension term |  |  |  |  |  |  | 6 months |  |  |  |  |
3025 JFK Construction Loan | Fixed rate debt | SOFR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective Interest Rate |  |  |  |  |  |  | 3.60% |  |  |  |  |
3025 JFK Construction Loan | Fixed rate debt | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 6.60% |  |  |  |  |
Avira Secured Term Loan | Fixed rate debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 5.81% |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 90,000,000 | $ 90,000,000 |  | 0 |  |
Effective Interest Rate |  |  |  |  |  |  |  | 1.85% |  |  |  |
Avira Secured Term Loan | Fixed rate debt | SOFR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective Interest Rate |  |  |  |  |  |  | 1.85% |  |  |  |  |
3151 Market C-PACE Loan | Fixed rate debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 57,324,000 |  |  | 57,324,000 |  |
Effective Interest Rate |  |  |  |  |  |  | 7.31% |  |  |  |  |
Principal balance outstanding | Fixed rate debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 147,324,000 |  |  | 235,338,000 |  |
$600.0M Unsecured Credit Facility | Unsecured term loans, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | 600,000,000.0 |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 149,000,000 |  |  | 0 |  |
Number of extensions | extension |  | 1 |  |  |  |  |  |  |  |  |  |
Extension term |  | 6 months |  |  |  |  |  |  |  |  |  |
$600.0M Unsecured Credit Facility | Unsecured term loans, net | Daily SOFR Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  |  | 0.10% |  |  |  |  |
$600.0M Unsecured Credit Facility | Unsecured term loans, net | SOFR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  |  | 1.50% |  |  |  |  |
Term Loan - Swapped to fixed | Unsecured term loans, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 5.41% |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 250,000,000 |  |  | 250,000,000 |  |
Term Loan - Swapped to fixed | Unsecured term loans, net | Daily SOFR Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  |  | 0.10% |  |  |  |  |
Term Loan - Swapped to fixed | Unsecured term loans, net | SOFR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  |  | 1.70% |  |  |  |  |
$450.0M 3.95% Guaranteed Notes due 2027 | Unsecured term loans, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 450,000,000.0 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 3.95% |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 450,000,000 |  |  | 450,000,000 |  |
Effective Interest Rate |  |  |  |  |  |  | 4.03% |  |  |  |  |
$350.0M 8.30% Guaranteed Notes due 2028 | Unsecured term loans, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 350,000,000.0 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 8.30% | 8.05% | 7.55% |  | 8.30% |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 350,000,000 |  |  | 350,000,000 |  |
Effective Interest Rate |  |  |  |  |  |  | 8.48% |  |  |  |  |
Variable interest rate |  |  | 0.25% | 0.25% | 0.25% |  |  |  |  |  |  |
$350.0M 4.55% Guaranteed Notes due 2029 | Unsecured term loans, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 350,000,000.0 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 4.55% |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 350,000,000 |  |  | 350,000,000 |  |
Effective Interest Rate |  |  |  |  |  |  | 4.30% |  |  |  |  |
$550.0M 8.88% Guaranteed Notes due 2029 | Unsecured term loans, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 550,000,000.0 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 8.88% |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 550,000,000 |  |  | 550,000,000 |  |
Effective Interest Rate |  |  |  |  |  |  | 8.52% |  |  |  |  |
$300.0M 6.13% Guaranteed Notes due 2031 | Unsecured term loans, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 300,000,000.0 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 6.13% |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 300,000,000 |  |  | 300,000,000 |  |
Effective Interest Rate |  |  |  |  |  |  | 6.13% |  |  |  |  |
Indenture IA (Preferred Trust I) | Unsecured term loans, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 5.14% |
Principal balance outstanding |  |  |  |  |  |  | $ 27,062,000 |  |  | 27,062,000 |  |
Indenture IA (Preferred Trust I) | Unsecured term loans, net | SOFR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  |  | 1.51% |  |  |  |  |
Indenture IB (Preferred Trust I) | Unsecured term loans, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal balance outstanding |  |  |  |  |  |  | $ 25,774,000 |  |  | 25,774,000 |  |
Indenture IB (Preferred Trust I) | Unsecured term loans, net | SOFR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  |  | 1.51% |  |  |  |  |
Indenture II (Preferred Trust II) | Unsecured term loans, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  | 5.24% |
Principal balance outstanding |  |  |  |  |  |  | $ 25,774,000 |  |  | $ 25,774,000 |  |
Indenture II (Preferred Trust II) | Unsecured term loans, net | SOFR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  |  | 1.51% |  |  |  |  |
8.80% Note 2028 | Unsecured term loans, net |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  | 8.80% |  |  |  |  |  |
Variable interest rate |  |  |  |  |  | 0.50% |  |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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