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Organization, Basis of Presentation and Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($) segment subsidiary shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Organization And Significant Accounting Policies [Line Items] |  |  |
Number of subsidiaries interest owned in general and limited partnership | subsidiary | 2 |  |
Non-qualifying income related to real estate portfolio | $ 0 |  |
Total amortization expense related to intangible assets | 16,300,000 | $ 16,700,000 | $ 19,100,000
Amortization related to below-market lease | 7,300,000 | 8,000,000.0 | 5,100,000
Payments of deferred financing costs | 1,379,000 | 400,000 | 5,355,000
Total amortization expense related to deferred financing costs is included in interest expense | 1,631,000 | 1,646,000 | 3,482,000
Deferred rent write-offs | $ 100,000 | 400,000 | 400,000
Uncertain tax positions (as a percent) | 50.00% |  |
Uncertain tax positions | $ 0 | 0 | 0
ARO liabilities accrued in connection with acquisitions | 0 | 95,000 | 979,000
Expenses recorded to general and administrative expense | 100,000 | 100,000 | 100,000
Aggregate undiscounted obligation on properties | $ 10,500,000 |  |
Number of reporting segments | segment | 1 |  |
Above Market Leases |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |
Total amortization expense related to intangible assets | $ 500,000 | $ 600,000 | $ 800,000
Minimum |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |
Expected lease up period for estimating carrying costs | 9 months |  |
Remaining term of in-place leases and unamortized lease (in years) | 7 years |  |
REIT taxable income to its stockholders (as a percent) | 90.00% |  |
Percentage of discount rate for calculating undiscounted obligation (as a percent) | 2.00% |  |
Maximum |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |
Expected lease up period for estimating carrying costs | 18 months |  |
Remaining term of in-place leases and unamortized lease (in years) | 15 years |  |
REIT taxable income to its stockholders (as a percent) | 100.00% |  |
Percentage of discount rate for calculating undiscounted obligation (as a percent) | 7.00% |  |
Building |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |
Estimated useful life (in years) | 39 years |  |
Improvements | Minimum |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |
Estimated useful life (in years) | 10 years |  |
Improvements | Maximum |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |
Estimated useful life (in years) | 25 years |  |
GCLP Business Trust I |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |
Subsidiary and business trust of the Company, formed under the laws of the Commonwealth of Massachusetts, date | Dec. 28, 2005 |  |
Percentage of limited partnership interest transferred to business unit (as a percent) | 99.00% |  |
Number of trust shares exchanged for limited partnership interest (in shares) | shares | 100 |  |
Operating Partnership |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |
Company ownership percentage of voting securities (as a percent) | 99.90% | 99.20% |
Gladstone Commercial Advisers, Inc. |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |
Company ownership percentage of voting securities (as a percent) | 100.00% |  |
GCLP Business Trust II |  |  |
Organization And Significant Accounting Policies [Line Items] |  |  |
Percentage of limited partnership interest transferred to business unit (as a percent) | 1.00% |  |
Number of trust shares exchanged for general partnership interest (in shares) | shares | 100 |  |

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