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Mortgage Notes Payable (Parenthetical) (Details) - USD ($)

12 Months Ended

Jan. 15, 2019

Dec. 31, 2018

Dec. 31, 2017

Debt Instrument [Line Items]

Real estate asset sold

$ 40,023,572

$ 23,464,380

Morena Office Center [Member]

Debt Instrument [Line Items]

Fixed interest rate on mortgage (in hundredth)

^[1],[2]

4.30%

Morena Office Center [Member] | Subsequent Event [Member]

Debt Instrument [Line Items]

Real estate asset sold

$ 5,600,000

Grand Pacific Center [Member]

Debt Instrument [Line Items]

Debt Instrument, Interest Rate Terms

Interest rate is subject to reset on September 1, 2023.

Fixed interest rate on mortgage (in hundredth)

^[1],[3]

4.02%

Model Home Properties [Member] | Minimum [Member]

Debt Instrument [Line Items]

Fixed interest rate on mortgage (in hundredth)

3.80%

Model Home Properties [Member] | Maximum [Member]

Debt Instrument [Line Items]

Fixed interest rate on mortgage (in hundredth)

5.60%

World Plaza [Member]

Debt Instrument [Line Items]

Debt instrument, variable interest rate basis

LIBOR

Weighted average interest rate

4.97%

World Plaza [Member] | LIBOR [Member]

Debt Instrument [Line Items]

Variable interest rate on mortgage (in hundredth)

2.75%

World Plaza [Member] | ABR [Member]

Debt Instrument [Line Items]

Variable interest rate on mortgage (in hundredth)

0.75%

[1]	Interest rates as of December 31, 2018.
[2]	Property held for sale as of December 31, 2018 and sold for $5.6 million on January 15, 2019.
[3]	Interest rate is subject to reset on September 1, 2023.

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-SubTopic 10
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