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Basis of Presentation and Significant Accounting Policies - Narrative (Details) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2024 variableInterestEntity | Dec. 31, 2024 USD ($) property variableInterestEntity development_site building investment | Dec. 31, 2024 USD ($) property variableInterestEntity development_site building investment property_partnership | Dec. 31, 2024 USD ($) property variableInterestEntity development_site building investment | Dec. 31, 2024 USD ($) property variableInterestEntity reportableSegment development_site building investment | Dec. 31, 2024 USD ($) operatingSegment property variableInterestEntity development_site building investment | Dec. 31, 2023 USD ($) building variableInterestEntity property investment | Dec. 31, 2022 USD ($)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Assets |  | $ 10,898,357,000 | $ 10,898,357,000 | $ 10,898,357,000 | $ 10,898,357,000 | $ 10,898,357,000 | $ 11,401,045,000 |
Liabilities |  | 5,289,488,000 | 5,289,488,000 | 5,289,488,000 | 5,289,488,000 | 5,289,488,000 | 5,741,352,000 |
Noncontrolling interest in consolidated subsidiary |  | $ 174,351,000 | $ 174,351,000 | $ 174,351,000 | $ 174,351,000 | $ 174,351,000 | $ 178,257,000 |
Number of equity method investments | investment |  | 0 | 0 | 0 | 0 | 0 | 0 |
Capitalized acquisition costs |  | $ 200,000 | $ 200,000 | $ 200,000 | $ 200,000 | $ 200,000 | $ 0 | $ 200,000
Number of properties classified as held for sale | property |  | 0 | 0 | 0 | 0 | 0 | 0 |
Number of consolidated property partnerships | property_partnership |  |  | 3 |  |  |  |  |
Conversion ratio |  |  |  | 1 |  |  |  |
Income tax provision |  | $ 0 |  |  |  |  | $ 0 | 0
Number of operating segments |  |  |  |  | 1 | 1 |  |
Percentage of redevelopment projects |  |  |  | 100.00% |  |  |  |
Lease Agreements | Minimum |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  | 1 year | 1 year | 1 year | 1 year | 1 year |  |
Lease Agreements | Maximum |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  | 20 years | 20 years | 20 years | 20 years | 20 years |  |
Disposal group, disposed of by sale |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Restricted cash |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |
Number of buildings | building |  | 0 | 0 | 0 | 0 | 0 | 0 |
Building and building improvements |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Depreciation of real estate |  | $ 308,000,000.0 |  |  |  |  | $ 300,100,000 | $ 287,800,000
Building and building improvements | Minimum |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Property depreciable lives |  | 25 years | 25 years | 25 years | 25 years | 25 years |  |
Building and building improvements | Maximum |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Property depreciable lives |  | 40 years | 40 years | 40 years | 40 years | 40 years |  |
Leasehold improvements | Minimum |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Property depreciable lives |  | 1 year | 1 year | 1 year | 1 year | 1 year |  |
Leasehold improvements | Maximum |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Property depreciable lives |  | 20 years | 20 years | 20 years | 20 years | 20 years |  |
Stabilized Office Properties | Washington |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Number of buildings | property |  | 10 | 10 | 10 | 10 | 10 |  |
Stabilized Office Properties | Texas |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Number of buildings | property |  | 1 | 1 | 1 | 1 | 1 |  |
Future development project | Washington |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Number of buildings | development_site |  | 1 | 1 | 1 | 1 | 1 |  |
Future development project | Texas |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Number of buildings | development_site |  | 1 | 1 | 1 | 1 | 1 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Number of VIEs | variableInterestEntity |  | 3 | 3 | 3 | 3 | 3 | 2 |
Number of VIEs established in the period | variableInterestEntity | 1 |  |  |  |  |  |  |
Assets |  | $ 435,500,000 | $ 435,500,000 | $ 435,500,000 | $ 435,500,000 | $ 435,500,000 | $ 416,700,000 |
Liabilities |  | 18,000,000.0 | 18,000,000.0 | 18,000,000.0 | 18,000,000.0 | 18,000,000.0 | 23,600,000 |
Variable Interest Entity, Primary Beneficiary | 100 First LLC and 303 Second LLC |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest in consolidated subsidiary |  | 169,400,000 | 169,400,000 | 169,400,000 | 169,400,000 | 169,400,000 | 173,700,000 |
Variable Interest Entity, Primary Beneficiary | Real estate investment |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |
Assets |  | $ 357,300,000 | $ 357,300,000 | $ 357,300,000 | $ 357,300,000 | $ 357,300,000 | $ 350,000,000 |

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