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REAL ESTATE ASSETS (Summary of Properties Owned) (Detail) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 05, 2020 | Jul. 31, 2019 | Jul. 01, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Real Estate Assets Owned |  |  |  | $ 179,192,000 | $ 200,206,620 | $ 211,108,065
Garden Gateway Plaza |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | Colorado Springs, Colorado | Colorado Springs, Colorado |
Real Estate Assets Owned |  |  |  | $ 11,440,000 | $ 11,428,000 | 11,166,000
World Plaza |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | San Bernardino, California | San Bernardino, California |
Real Estate Assets Owned |  |  |  | $ 8,334,000 | $ 8,305,000 | 6,180,000
Executive Office Park |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | Colorado Springs, Colorado | Colorado Springs, Colorado |
Real Estate Assets Owned |  |  |  | $ 7,654,000 | $ 7,723,000 | 7,976,000
Waterman Plaza |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | San Bernardino, California | San Bernardino, California |
Real Estate Assets Owned |  |  |  | $ 4,867,000 | $ 4,889,000 | 4,977,000
Morena Office Center |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  |  | San Diego, California |
Real Estate Assets Owned |  |  |  |  |  | 4,716,000
Genesis Plaza |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | San Diego, California | San Diego, California |
Real Estate Assets Owned |  |  |  | $ 8,721,000 | $ 8,789,000 | 8,449,000
Proceeds from sale of property |  |  | $ 2,900,000 |  |  |
Dakota Center |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | Fargo, North Dakota | Fargo, North Dakota |
Real Estate Assets Owned |  |  |  | $ 8,772,000 | $ 8,855,000 | 9,139,000
The Presidio |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  |  | Aurora, Colorado |
Real Estate Assets Owned |  |  |  |  |  | 6,499,000
Proceeds from sale of property |  | $ 12,300,000 |  |  |  |
Grand Pacific Center |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | Bismarck, North Dakota | Bismarck, North Dakota |
Real Estate Assets Owned |  |  |  | $ 5,885,000 | $ 5,914,000 | 5,814,000
Union Terrace |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  |  | Lakewood, Colorado |
Real Estate Assets Owned |  |  |  |  | $ 8,425,000 | 7,983,000
Centennial Tech Center |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  |  | Colorado Springs, Colorado |
Real Estate Assets Owned |  |  |  |  | $ 13,132,000 | 12,960,000
Centennial Tech Center | Subsequent Event |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Proceeds from sale of property | $ 15,000,000 |  |  |  |  |
Arapahoe Center |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | Centennial, Colorado | Centennial, Colorado |
Real Estate Assets Owned |  |  |  | $ 9,619,000 | $ 9,748,000 | 10,251,000
Union Town Center |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | Colorado Springs, Colorado | Colorado Springs, Colorado |
Real Estate Assets Owned |  |  |  | $ 9,552,000 | $ 9,612,000 | 9,904,000
West Fargo Industrial |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | West Fargo, North Dakota | Fargo, North Dakota |
Real Estate Assets Owned |  |  |  | $ 7,188,000 | $ 7,212,000 | 7,243,000
300 N.P. |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | Fargo, North Dakota | Fargo, North Dakota |
Real Estate Assets Owned |  |  |  | $ 3,371,000 | $ 3,405,000 | 3,543,000
Research Parkway |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | Colorado Springs, Colorado | Colorado Springs, Colorado |
Real Estate Assets Owned |  |  |  | $ 2,492,000 | $ 2,512,000 | 2,589,000
One Park Center |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | Westminster, Colorado | Westminster, Colorado |
Real Estate Assets Owned |  |  |  | $ 8,898,000 | $ 8,518,000 | 8,453,000
Highland Court |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | Centennial, Colorado | Centennial, Colorado |
Real Estate Assets Owned |  |  |  | $ 11,260,000 | $ 11,421,000 | 11,845,000
Shea Center II |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Location |  |  |  | Highlands Ranch, Colorado | Highlands Ranch, Colorado |
Real Estate Assets Owned |  |  |  | $ 21,706,000 | $ 21,853,000 | 22,658,000
Industrial Office Properties |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Real Estate Assets Owned |  |  |  |  | 151,741,000 | 162,345,000
Model Home properties |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Real Estate Assets Owned |  |  |  | 49,433,000 | $ 48,466,000 | $ 48,763,000
Presidio Property Trust, Inc. properties |  |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |  |
Real Estate Assets Owned |  |  |  | $ 129,759,000 |  |

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