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Mortgage Notes Payable (Details) - USD ($)

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Debt Instrument [Line Items]

Mortgage notes payable

$ 151,140,916

$ 162,005,679

Unamortized loan costs

(1,426,740)

(1,682,942)

Mortgage notes payable, net

$ 149,714,176

160,322,737

Port of San Diego Complex [Member]

Debt Instrument [Line Items]

Mortgage notes payable

^[1]

9,575,508

Fixed interest rate on mortgage (in hundredths)

^[1],[2]

4.75%

Maturity date

^[1]

Mar. 05, 2020

Garden Gateway Plaza [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 6,270,896

6,445,300

Fixed interest rate on mortgage (in hundredths)

^[2]

5.00%

Maturity date

Apr. 05, 2020

World Plaza [Member]

Debt Instrument [Line Items]

Mortgage notes payable

^[3]

$ 3,350,539

Maturity date

^[3]

Jul. 05, 2020

Variable interest rate on mortgage (in hundredths)

^[2],[3]

5.10%

West Fargo Industrial [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 4,292,809

4,365,449

Fixed interest rate on mortgage (in hundredths)

^[2]

4.79%

Maturity date

Sep. 06, 2020

Morena Office Center [Member]

Debt Instrument [Line Items]

Mortgage notes payable

^[4]

$ 1,567,358

2,156,479

Fixed interest rate on mortgage (in hundredths)

^[2],[4]

4.30%

Maturity date

^[4]

Jun. 01, 2021

Waterman Plaza [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 3,369,960

3,850,365

Fixed interest rate on mortgage (in hundredths)

^[2]

5.78%

Maturity date

Apr. 29, 2021

Pacific Oaks Plaza [Member]

Debt Instrument [Line Items]

Mortgage notes payable

^[5]

1,466,351

Fixed interest rate on mortgage (in hundredths)

^[2],[5]

4.30%

Maturity date

^[5]

Jun. 01, 2021

300 N.P. [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 2,348,443

2,380,703

Fixed interest rate on mortgage (in hundredths)

^[2]

4.95%

Maturity date

Jun. 11, 2022

Highland Court [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 6,568,320

6,695,541

Fixed interest rate on mortgage (in hundredths)

^[2]

3.82%

Maturity date

Sep. 01, 2022

Dakota Center [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 10,314,520

10,492,904

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

$ 6,354,153

6,454,448

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

$ 5,992,905

6,000,000

Fixed interest rate on mortgage (in hundredths)

^[2]

4.54%

Maturity date

Dec. 01, 2021

Centennial Tech Center [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 9,745,811

9,908,235

Fixed interest rate on mortgage (in hundredths)

^[2]

4.43%

Maturity date

Jan. 05, 2024

Arapahoe Center [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 8,233,567

8,364,088

Fixed interest rate on mortgage (in hundredths)

^[2]

4.34%

Maturity date

Jan. 05, 2025

Research Parkway [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 1,864,139

1,909,012

Fixed interest rate on mortgage (in hundredths)

^[2]

3.94%

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]

6,000,000

Fixed interest rate on mortgage (in hundredths)

^[2],[6]

4.31%

Maturity date

^[6]

Apr. 11, 2025

Executive Office Park [Member]

Debt Instrument [Line Items]

Mortgage notes payable

^[7]

$ 4,947,808

4,151,161

Fixed interest rate on mortgage (in hundredths)

^[2],[7]

4.83%

Maturity date

^[7]

Jun. 01, 2027

Genesis Plaza [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 6,476,032

6,500,000

Fixed interest rate on mortgage (in hundredths)

^[2]

4.71%

Maturity date

Aug. 25, 2025

One Park Centre [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 6,585,922

6,610,000

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

Grand Pacific Center [Member]

Debt Instrument [Line Items]

Mortgage notes payable

^[8]

$ 3,961,304

4,057,752

Fixed interest rate on mortgage (in hundredths)

^[2],[8]

4.02%

Maturity date

^[8]

Aug. 01, 2037

Office/Industrial and Retail Properties [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 118,411,986

133,550,796

Model Home Properties [Member]

Debt Instrument [Line Items]

Mortgage notes payable

$ 32,728,930

$ 28,454,883

Model Home Properties [Member] | Minimum [Member]

Debt Instrument [Line Items]

Fixed interest rate on mortgage (in hundredths)

3.80%

Maturity date

Jan. 01, 2019

Model Home Properties [Member] | Maximum [Member]

Debt Instrument [Line Items]

Fixed interest rate on mortgage (in hundredths)

5.60%

Maturity date

Jan. 01, 2020

[1]	Port of San Diego Complex was sold on December 20, 2018.
[2]	Interest rates as of December 31, 2018.
[3]	Interest on this loan is ABR + 0.75% and LIBOR plus 2.75%. For the year-ended December 31, 2018, the weighted average interest rate was 4.97%.
[4]	Property held for sale as of December 31, 2018 and sold for $5.6 million on January 15, 2019.
[5]	Pacific Oaks Plaza was sold on December 27, 2018.
[6]	Yucca Valley Retail Center was sold on December 31, 2018.
[7]	The loan was refinanced to a new loan on June 1, 2018.
[8]	Interest rate is subject to reset on September 1, 2023.

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