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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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