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Subsequent Events (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 22, 2021 USD ($) | Oct. 08, 2021 $ / shares | Oct. 05, 2021 USD ($) property | May 27, 2021 USD ($) | Sep. 30, 2021 USD ($) $ / shares | Jun. 30, 2021 $ / shares | Mar. 31, 2021 $ / shares | Sep. 30, 2020 $ / shares | Jun. 30, 2020 $ / shares | Mar. 31, 2020 $ / shares | Sep. 30, 2021 USD ($) | Oct. 29, 2021 USD ($) | Oct. 28, 2021 USD ($) | Dec. 31, 2020 USD ($)
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared per share (in dollars per share) | $ / shares |  |  |  |  | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 | $ 0.09 |  |  |  |
Gain (loss) on sale of property |  |  |  |  | $ 8,632 |  |  |  |  |  | $ 29,258 |  |  |
Repayments of unsecured debt |  |  |  |  |  |  |  |  |  |  | 245,000 |  |  |
Distributions from non-consolidated REITs |  |  |  |  |  |  |  |  |  |  | 421 |  |  |
Amount Drawn |  |  |  |  | $ 21,000 |  |  |  |  |  | 21,000 |  |  | $ 21,000
FSP Monument Circle LLC | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional loan amount |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 |  |
Amount Drawn |  |  |  |  |  |  |  |  |  |  |  | $ 24,000 | $ 21,000 |
BAML Revolver | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of unsecured debt | $ 15,000 |  |  |  |  |  |  |  |  |  |  |  |  |
BAML Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of unsecured debt |  |  |  |  |  |  |  |  |  |  | $ 90,000 |  |  |
BAML Term Loan | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of unsecured debt | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Office properties in Chantilly, VA | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of office properties to be sold | property |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Sale price |  |  | $ 40,000 |  |  |  |  |  |  |  |  |  |  |
Office Properties in Atlanta, Georgia |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price |  |  |  | $ 219,500 |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property |  |  |  | $ 22,800 |  |  |  |  |  |  |  |  |  |
Office Properties in Atlanta, Georgia | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale price | 223,900 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of property | $ 86,800 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash distribution declared | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared per share (in dollars per share) | $ / shares |  | $ 0.09 |  |  |  |  |  |  |  |  |  |  |  |

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