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v3.20.1

Related Party Transactions (Details) |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 05, 2019 USD ($) a $ / shares shares | May 09, 2018 shares | Aug. 31, 2016 a | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
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 |  |  |  | $ 120,700 | $ 96,500 |
Deferred compensation, employee contribution, percentage |  |  |  | 2.00% |  |
Deferred compensation, company contribution, amount |  |  |  | $ 49,500 | $ 56,500 |
Deferred compensation, company contribution, percentage |  |  |  | 3 | 3 |
Deferred compensation, cumulative unfunded liability |  |  |  | $ 3,200,000 |  | $ 3,100,000
Ancillary costs and expenses |  |  |  | 2,200,000 | $ 2,200,000 |
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses |  |  |  | $ 801,700 |  | $ 918,700
Percentage of annual increase in base rent |  |  |  | 3.00% |  |
Rent expense |  |  |  | $ 202,300 | 193,900 |
Insurance commissions and fees expense |  |  |  | $ 105,200 | $ 73,400 |
Ashbrook Marketplace | BF Saul Real Estate Investment Trust |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Area of real estate acquired (in acres) | a |  |  | 13.7 |  |  |
Limited partnership units issued for purchase (in shares) | shares |  | 176,680 |  |  |  |
Land Contributed In Contribution Agreement [Member] | BF Saul Real Estate Investment Trust |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Area of land | a | 6.8 |  |  |  |  |
Leasehold Interest Contributed In Contribution Agreement [Member] | BF Saul Real Estate Investment Trust |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Area of land | a | 1.3 |  |  |  |  |
Contribution Agreement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Number of partnership units issued in transaction (in shares) | shares | 1,416,071 |  |  |  |  |
Value of units issued (in dollars per share) | $ / shares | $ 56.00 |  |  |  |  |
Value assigned to units issued | $ 79,300,000 |  |  |  |  |

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