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v3.21.2

Related Party Transactions (Details) |  |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 shares | May 09, 2018 shares | Aug. 31, 2016 a | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 05, 2021 a | Dec. 31, 2020 USD ($) | Nov. 05, 2019 a
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, maximum percentage |  |  |  | 6.00% |  |  |  |
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, amount |  |  |  | $ 328,500 | $ 255,200 |  |  |
Deferred compensation, employee contribution |  |  |  | 2.00% |  |  |  |
Deferred compensation, company contribution |  |  |  | $ 120,800 | $ 164,800 |  |  |
Deferred compensation, company contribution percentage |  |  |  | 3 | 3 |  |  |
Deferred compensation, cumulative unfunded liability |  |  |  | $ 3,000,000 |  |  | $ 2,900,000 |
Ancillary costs and expenses |  |  |  | 5,900,000 | $ 6,000,000 |  |  |
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses |  |  |  | $ 883,900 |  |  | $ 782,700 |
Percentage of annual increase in base rent |  |  |  | 3.00% |  |  |  |
Rent expense |  |  |  | $ 611,200 | 609,200 |  |  |
Insurance commissions and fees expense |  |  |  | $ 280,700 | $ 320,300 |  |  |
BF Saul Real Estate Investment Trust | Contribution Agreement |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Area of land | a |  |  |  |  |  |  |  | 10.3
Twinbrook Metro Station | BF Saul Real Estate Investment Trust | Contribution Agreement |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Area of land | a |  |  |  |  |  | 6.8 |  | 6.8
Twinbrook Metro Station Leasehold Interest | BF Saul Real Estate Investment Trust | Contribution Agreement |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Area of land | a |  |  |  |  |  | 1.3 |  | 1.3
Ashbrook Marketplace | BF Saul Real Estate Investment Trust |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Area of real estate acquired | a |  |  | 13.7 |  |  |  |  |
Limited partnership units issued for purchase (in shares) | shares | 93,674 | 176,680 |  |  |  |  |  |

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