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MANAGEMENT SERVICES BUSINESS - General Information (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 58 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 26, 2019 USD ($) property shares | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) shares | Dec. 12, 2023 USD ($) | Feb. 16, 2023 USD ($) | Oct. 26, 2021 USD ($)
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Investment in Alpine Income Property Trust, Inc. |  | $ 42,997,000 |  | $ 42,997,000 |  | $ 39,445,000 |  |  | $ 42,997,000 |  |  |
Revenues |  | 31,805,000 | $ 28,470,000 | 88,777,000 | $ 79,234,000 |  |  |  |  |  |  |
Management Fee Income |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | 1,124,000 | 1,094,000 | 3,360,000 | $ 3,294,000 |  |  |  |  |  |  |
Management Fee Income | Portfolio Management Agreement |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  | 200,000 |  |  |  |  |  |  |  |
Management Fee Income | Portfolio Management Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | 100,000 |  |  |  |  |  |  |  |  |  |
Management Fee Income | Asset Management Agreement |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  | $ 100,000 |  |  |  |  |  |  |  |
Management Fee Income | Asset Management Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 100,000 |  |  |  |  |  |  |  |  |  |
Alpine Income Property OP, LP Limited Partnership Units |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Number of contributed properties | property | 5 |  |  |  |  |  |  |  |  |  |  |
Aggregate of OP units | shares | 1,223,854 |  |  |  |  |  |  |  |  |  |  |
Initial value | $ 23,300,000 |  |  |  |  |  |  |  |  |  |  |
Share purchased | shares |  |  |  |  |  |  |  |  | 1,223,854 |  |  |
Investment ownership percentage (as a percent) |  | 7.90% |  | 7.90% |  |  |  |  | 7.90% |  |  |
Investment in Alpine Income Property Trust, Inc. |  | $ 22,274,000 |  | $ 22,274,000 |  | 20,695,000 |  |  | $ 22,274,000 |  |  |
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Investment ownership percentage (as a percent) |  | 15.30% |  | 15.30% |  |  |  |  | 15.30% |  |  |
Investment in Alpine Income Property Trust, Inc. |  | $ 42,997,000 |  | $ 42,997,000 |  | 39,445,000 |  |  | $ 42,997,000 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Share purchased | shares | 421,053 |  |  | 29,807 | 129,271 |  | 155,665 | 8,088 | 1,138,621 |  |  |
Purchase price of shares | $ 8,000,000.0 |  |  | $ 400,000 | $ 2,100,000 |  | $ 2,700,000 | $ 100,000 |  |  |  |
Investment ownership percentage (as a percent) |  | 7.40% |  | 7.40% |  |  |  |  | 7.40% |  |  |
Investment in Alpine Income Property Trust, Inc. |  | $ 20,723,000 |  | $ 20,723,000 |  | 18,750,000 |  |  | $ 20,723,000 |  |  |
Private placement |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Share purchased | shares | 394,737 |  |  |  |  |  |  |  |  |  |  |
Purchase price of shares | $ 7,500,000 |  |  |  |  |  |  |  |  |  |  |
Management Agreement PINE |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Percentage of base management fee |  |  |  | 0.375% |  |  |  |  |  |  |  |
Management fee (as a percent) |  |  |  | 1.50% |  |  |  |  |  |  |  |
Percentage of cumulative annual hurdle rate |  |  |  | 8.00% |  |  |  |  |  |  |  |
Amount of threshold incentive fee |  |  |  | $ 0.00 |  |  |  |  |  |  |  |
Percentage of multiply factor |  |  |  | 15.00% |  |  |  |  |  |  |  |
Management fee revenue earned |  | 1,100,000 | 1,100,000 | $ 3,100,000 | 3,300,000 |  |  |  |  |  |  |
Dividends received |  | 700,000 | $ 600,000 | 1,900,000 | $ 1,900,000 |  |  |  |  |  |  |
Alpine |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Number of properties sold | property | 15 |  |  |  |  |  |  |  |  |  |  |
Aggregate cash consideration | $ 125,900,000 |  |  |  |  |  |  |  |  |  |  |
Amount of shares authorized for purchase by the board |  | $ 0 |  | $ 0 |  |  |  |  | $ 0 | $ 2,000,000.0 | $ 2,100,000 | $ 5,000,000.0
Average price per share | $ / shares |  |  |  | $ 14.97 | $ 16.21 |  | $ 17.57 | $ 17.65 |  |  |  |
Investee | Alpine Income Property Trust, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee income |  |  |  |  |  | $ 0 |  |  |  |  |  |

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