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Mortgage Notes Payable (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 164,701,057 | $ 160,828,604
Unamortized loan costs |  | (1,781,974) | (1,942,493)
Mortgage notes payable, net |  | 162,919,083 | 158,886,111
Bismarck Office Building [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [1] | $ 4,083,446 | 4,158,998
Fixed interest rate on mortgage (in hundredths) | [1],[2] | 4.02% |
Maturity date | [1] | Aug. 01, 2037 |
Rangewood Medical Office Building [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  |  | 958,106
Fixed interest rate on mortgage (in hundredths) | [2] | 4.95% |
Maturity date |  | Jan. 01, 2019 |
Regatta Square [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  |  | 1,150,566
Fixed interest rate on mortgage (in hundredths) | [2] | 4.95% |
Maturity date |  | Jan. 01, 2019 |
Port of San Diego Complex [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 9,645,958 | 9,852,456
Fixed interest rate on mortgage (in hundredths) | [2] | 4.75% |
Maturity date |  | Mar. 05, 2020 |
Garden Gateway Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,491,497 | 6,626,739
Fixed interest rate on mortgage (in hundredths) | [2] | 5.00% |
Maturity date |  | Feb. 05, 2020 |
West Fargo Industrial [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 4,383,209 | 4,434,655
Fixed interest rate on mortgage (in hundredths) | [2] | 4.79% |
Maturity date |  | Aug. 04, 2020 |
Morena Office Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [3] | $ 2,173,577 | 2,224,839
Fixed interest rate on mortgage (in hundredths) | [2],[3] | 4.50% |
Maturity date | [3] | Jan. 01, 2021 |
Waterman Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 3,872,112 | 3,939,037
Fixed interest rate on mortgage (in hundredths) | [2] | 4.25% |
Maturity date |  | Apr. 29, 2021 |
Pacific Oaks Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 1,477,981 | 1,512,640
Fixed interest rate on mortgage (in hundredths) | [2] | 4.50% |
Maturity date |  | Jun. 01, 2021 |
Shoreline Medical Building [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  |  | 3,602,238
Fixed interest rate on mortgage (in hundredths) | [2] | 5.10% |
Maturity date |  | Jun. 01, 2022 |
Highland Court [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,729,472 | 6,829,348
Fixed interest rate on mortgage (in hundredths) | [2] | 3.82% |
Maturity date |  | Sep. 01, 2022 |
Dakota Bank Buildings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 10,538,950 | 10,677,761
Fixed interest rate on mortgage (in hundredths) | [2] | 4.74% |
Maturity date |  | Jul. 06, 2024 |
Union Terrace [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,480,347 | 6,558,704
Fixed interest rate on mortgage (in hundredths) | [2] | 4.50% |
Maturity date |  | Sep. 05, 2024 |
The Presidio [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,000,000 | 6,000,000
Fixed interest rate on mortgage (in hundredths) | [2] | 4.54% |
Maturity date |  | Dec. 01, 2021 |
Research Parkway [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 1,920,972 | 1,956,154
Fixed interest rate on mortgage (in hundredths) | [2] | 3.94% |
Maturity date |  | Jan. 05, 2025 |
Centennial Tech Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 9,950,275 | 10,077,242
Fixed interest rate on mortgage (in hundredths) | [2] | 4.34% |
Maturity date |  | Nov. 05, 2024 |
Arapahoe Service Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 8,397,863 | 8,500,000
Fixed interest rate on mortgage (in hundredths) | [2] | 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) | [2] | 4.28% |
Maturity date |  | Jan. 05, 2025 |
Yucca Valley Retail Center [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,000,000 | 6,000,000
Fixed interest rate on mortgage (in hundredths) | [2] | 4.30% |
Maturity date |  | Apr. 11, 2025 |
Executive Office Park [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable | [4] | $ 4,171,269 | 4,231,842
Fixed interest rate on mortgage (in hundredths) | [2],[4] | 5.80% |
Maturity date | [4] | Jul. 01, 2025 |
Genesis Plaza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,500,000 | 6,610,000
Fixed interest rate on mortgage (in hundredths) | [2] | 4.65% |
Maturity date |  | Aug. 25, 2025 |
One Park Centre [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 6,610,000 | 6,500,000
Fixed interest rate on mortgage (in hundredths) | [2] | 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) | [2] | 4.92% |
Maturity date |  | Jan. 05, 2026 |
300 N.P. [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 2,388,948 |
Fixed interest rate on mortgage (in hundredths) | [2] | 4.02% |
Maturity date |  | Aug. 01, 2037 |
Presidio Property Trust, Inc Properties [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 133,983,376 | 138,568,825
Fixed interest rate on mortgage (in hundredths) | [2] | 4.71% |
Model Home Properties [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Mortgage notes payable |  | $ 30,717,681 | $ 22,259,779
Model Home Properties [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate on mortgage (in hundredths) |  | 3.80% |
Maturity date | [5] | Jan. 01, 2017 |
Model Home Properties [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Fixed interest rate on mortgage (in hundredths) |  | 5.50% |
Maturity date | [5] | Jan. 01, 2020 |
[1] | Interest rate is subject to reset on September 1, 2023 and on September 1, 2030.
[2] | Interest rates as of September 30, 2017.
[3] | Interest rate is subject to reset on May 4, 2018.
[4] | Interest rate is subject to reset on July 1, 2018
[5] | Each Model Home has a stand-alone mortgage note at interest rates ranging from 3.8% to 5.5% per annum (at September 30, 2017).

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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