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Mortgage Notes Payable (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 149,353,087 | $ 151,140,916
Unamortized loan costs |  | (1,248,324) | (1,426,740)
Mortgage notes payable, total net |  | 148,104,763 | 149,714,176
Garden Gateway Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,172,350 | 6,270,896
Fixed interest rate on mortgage (in hundredths) | [1] | 5.00% |
Maturity date |  | Feb. 05, 2020 |
World Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [2],[3] | $ 5,031,037 | 3,350,539
Maturity date | [2],[3] | Jul. 05, 2020 |
Variable interest rate on mortgage (in hundredths) | [1],[2],[3] | 5.18% |
West Fargo Industrial [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 4,254,866 | 4,292,809
Fixed interest rate on mortgage (in hundredths) | [1] | 4.79% |
Maturity date |  | Sep. 06, 2020 |
Morena Office Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [4] |  | 1,567,358
Fixed interest rate on mortgage (in hundredths) | [1],[4] | 4.30% |
Maturity date | [4] | Jun. 01, 2021 |
Waterman Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 3,312,486 | 3,369,960
Fixed interest rate on mortgage (in hundredths) | [1] | 5.78% |
Maturity date |  | Apr. 29, 2021 |
Union Terrace [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [3] | $ 6,297,528 | 6,354,153
Fixed interest rate on mortgage (in hundredths) | [1],[3] | 4.50% |
Maturity date | [3] | Aug. 05, 2024 |
300 N.P. [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 2,330,160 | 2,348,443
Fixed interest rate on mortgage (in hundredths) | [1] | 4.95% |
Maturity date |  | Jun. 11, 2022 |
Highland Court [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,497,029 | 6,568,320
Fixed interest rate on mortgage (in hundredths) | [1] | 3.82% |
Maturity date |  | Sep. 01, 2022 |
Dakota Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 10,213,650 | 10,314,520
Fixed interest rate on mortgage (in hundredths) | [1] | 4.74% |
Maturity date |  | Jul. 06, 2024 |
The Presidio [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [5] | $ 5,945,942 | 5,992,905
Fixed interest rate on mortgage (in hundredths) | [1],[5] | 4.54% |
Maturity date | [5] | Dec. 01, 2021 |
Centennial Tech Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [3] | $ 9,654,169 | 9,745,811
Fixed interest rate on mortgage (in hundredths) | [1],[3] | 4.43% |
Maturity date | [3] | Dec. 05, 2024 |
Research Parkway [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 1,838,972 | 1,864,139
Fixed interest rate on mortgage (in hundredths) | [1] | 3.94% |
Maturity date |  | Jan. 05, 2025 |
Arapahoe Service Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 8,159,966 | 8,233,567
Fixed interest rate on mortgage (in hundredths) | [1] | 4.34% |
Maturity date |  | Jan. 05, 2025 |
Union Town Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 8,440,000 | 8,440,000
Fixed interest rate on mortgage (in hundredths) | [1] | 4.28% |
Maturity date |  | Jan. 05, 2025 |
Executive Office Park [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 4,894,344 | 4,947,808
Fixed interest rate on mortgage (in hundredths) | [1] | 4.83% |
Maturity date |  | Jun. 01, 2027 |
Genesis Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,427,233 | 6,476,032
Fixed interest rate on mortgage (in hundredths) | [1] | 4.71% |
Maturity date |  | Sep. 06, 2025 |
One Park Centre [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,536,887 | 6,585,922
Fixed interest rate on mortgage (in hundredths) | [1] | 4.77% |
Maturity date |  | Sep. 05, 2025 |
Shea Center II [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 17,727,500 | 17,727,500
Fixed interest rate on mortgage (in hundredths) | [1] | 4.92% |
Maturity date |  | Jan. 05, 2026 |
Grand Pacific Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [6] | $ 3,907,181 | 3,961,304
Fixed interest rate on mortgage (in hundredths) | [1],[6] | 4.02% |
Maturity date | [6] | Aug. 01, 2037 |
Presidio Property Trust, Inc Properties [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 117,641,300 | 118,411,986
Model Home Properties [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 31,711,787 | $ 32,728,930
Model Home Properties [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate on mortgage (in hundredths) |  | 3.72% |
Maturity date |  | Jan. 01, 2019 |
Model Home Properties [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate on mortgage (in hundredths) |  | 5.75% |
Maturity date |  | Jan. 01, 2022 |
[1] | Interest rates as of June 30, 2019.
[2] | Interest on this loan is ABR plus 0.75% and LIBOR plus 2.75%. For the six months ended June 30, 2019, the weighted average interest rate was 5.29%.
[3] | Properties held for sale as of June 30, 2019.
[4] | Morena Office Center was sold on January 15, 2019.
[5] | Property held for sale as of June 30, 2019 and sold on July 31, 2019.
[6] | Interest rate is subject to reset on September 1, 2023.

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