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MORTGAGE NOTES PAYABLE (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Mortgage notes payable	$ 141,084,875	$ 151,140,916
Unamortized loan costs	(1,109,867)	(1,426,740)
Mortgage Notes Payable, net	11,623,164	0
Garden Gateway Plaza
Debt Instrument [Line Items]
Mortgage notes payable	$ 6,122,148	6,270,896
Interest rate	5.00%
Maturity	Feb. 05, 2020
Fixed interest rate on mortgage (in hundredth)	5.00%
World Plaza
Debt Instrument [Line Items]
Mortgage notes payable	$ 5,005,210	3,350,539
Variable Interest Rate	5.18%
Maturity	Jul. 05, 2020
Weighted average interest rate	5.29%
World Plaza | ABR
Debt Instrument [Line Items]
Variable interest rate on mortgage (in hundredth)	0.75%
World Plaza | LIBOR
Debt Instrument [Line Items]
Variable interest rate on mortgage (in hundredth)	2.75%
West Fargo Industrial
Debt Instrument [Line Items]
Mortgage notes payable	$ 4,236,111	4,292,809
Interest rate	4.79%
Maturity	Sep. 06, 2020
Fixed interest rate on mortgage (in hundredth)	4.79%
Morena Office Center
Debt Instrument [Line Items]
Mortgage notes payable	$ 0	1,567,358
Interest rate	4.30%
Maturity	Jun. 01, 2021
Fixed interest rate on mortgage (in hundredth)	4.30%
Waterman Plaza
Debt Instrument [Line Items]
Mortgage notes payable	$ 3,293,690	3,369,960
Interest rate	5.78%
Maturity	Apr. 29, 2021
Fixed interest rate on mortgage (in hundredth)	5.78%
300 N.P.
Debt Instrument [Line Items]
Mortgage notes payable	$ 2,321,165	2,348,443
Interest rate	4.95%
Maturity	Jun. 11, 2022
Fixed interest rate on mortgage (in hundredth)	4.95%
Highland Court
Debt Instrument [Line Items]
Mortgage notes payable	$ 6,460,871	6,568,320
Interest rate	3.82%
Maturity	Sep. 01, 2022
Fixed interest rate on mortgage (in hundredth)	3.82%
Dakota Center
Debt Instrument [Line Items]
Mortgage notes payable	$ 10,163,642	10,314,520
Interest rate	4.74%
Maturity	Jul. 06, 2024
Fixed interest rate on mortgage (in hundredth)	4.74%
Union Terrace
Debt Instrument [Line Items]
Mortgage notes payable	$ 6,269,514	6,354,153
Interest rate	4.50%
Maturity	Aug. 05, 2024
Fixed interest rate on mortgage (in hundredth)	4.50%
The Presidio
Debt Instrument [Line Items]
Mortgage notes payable	$ 0	5,992,905
Interest rate	4.54%
Maturity	Dec. 01, 2021
Fixed interest rate on mortgage (in hundredth)	4.54%
Centennial Tech Center
Debt Instrument [Line Items]
Mortgage notes payable	$ 9,608,758	9,745,811
Interest rate	4.43%
Maturity	Dec. 05, 2024
Fixed interest rate on mortgage (in hundredth)	4.43%
Research Parkway
Debt Instrument [Line Items]
Mortgage notes payable	$ 1,826,202	1,864,139
Interest rate	3.94%
Maturity	Jan. 05, 2025
Fixed interest rate on mortgage (in hundredth)	3.94%
Arapahoe Service Center
Debt Instrument [Line Items]
Mortgage notes payable	$ 8,123,537	8,233,567
Interest rate	4.34%
Maturity	Jan. 05, 2025
Fixed interest rate on mortgage (in hundredth)	4.34%
Union Town Center
Debt Instrument [Line Items]
Mortgage notes payable	$ 8,440,000	8,440,000
Interest rate	4.28%
Maturity	Jan. 05, 2025
Fixed interest rate on mortgage (in hundredth)	4.28%
Executive Office Park
Debt Instrument [Line Items]
Mortgage notes payable	$ 4,867,125	4,947,808
Interest rate	4.83%
Maturity	Jun. 01, 2027
Fixed interest rate on mortgage (in hundredth)	4.83%
Genesis Plaza
Debt Instrument [Line Items]
Mortgage notes payable	$ 6,403,234	6,476,032
Interest rate	4.71%
Maturity	Sep. 06, 2025
Fixed interest rate on mortgage (in hundredth)	4.71%
One Park Centre
Debt Instrument [Line Items]
Mortgage notes payable	$ 6,512,787	6,585,922
Interest rate	4.77%
Maturity	Sep. 05, 2025
Fixed interest rate on mortgage (in hundredth)	4.77%
Shea Center II
Debt Instrument [Line Items]
Mortgage notes payable	$ 17,727,500	17,727,500
Interest rate	4.92%
Maturity	Jan. 05, 2026
Fixed interest rate on mortgage (in hundredth)	4.92%
Grand Pacific Center
Debt Instrument [Line Items]
Mortgage notes payable	$ 3,879,710	3,961,304
Interest rate	4.02%
Maturity	Aug. 01, 2037
Fixed interest rate on mortgage (in hundredth)	4.02%
Presidio Property Trust, Inc. properties
Debt Instrument [Line Items]
Mortgage notes payable	$ 111,261,204	118,411,986
Model Home properties
Debt Instrument [Line Items]
Mortgage notes payable	$ 29,823,671	$ 32,728,930
Model Home properties | Minimum
Debt Instrument [Line Items]
Interest rate	3.72%
Fixed interest rate on mortgage (in hundredth)	3.72%
Model Home properties | Maximum
Debt Instrument [Line Items]
Interest rate	5.75%
Fixed interest rate on mortgage (in hundredth)	5.75%

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