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REAL ESTATE ASSETS (Summary of Properties Owned) (Details) - USD ($)				12 Months Ended
	Feb. 05, 2020	Jul. 31, 2019	Jul. 01, 2019	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, net (in thousands)				$ 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
Real estate assets, net (in thousands)				$ 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
Real estate assets, net (in thousands)				$ 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
Real estate assets, net (in thousands)				$ 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
Real estate assets, net (in thousands)				$ 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, net (in thousands)				$ 0	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
Real estate assets, net (in thousands)				$ 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
Real estate assets, net (in thousands)				$ 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, net (in thousands)				$ 0	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
Real estate assets, net (in thousands)				$ 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, net (in thousands)				$ 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, net (in thousands)				$ 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	$ 15,000,000.0
Arapahoe Center
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location				Centennial, Colorado
Real estate assets, net (in thousands)				$ 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
Real estate assets, net (in thousands)				$ 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				Fargo, North Dakota
Real estate assets, net (in thousands)				$ 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
Real estate assets, net (in thousands)				$ 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
Real estate assets, net (in thousands)				$ 2,512,000	2,589,000
One Park Centre
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Location				Westminster, Colorado
Real estate assets, net (in thousands)				$ 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
Real estate assets, net (in thousands)				$ 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
Real estate assets, net (in thousands)				$ 21,853,000	22,658,000
Office/Industrial Properties
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Real estate assets, net (in thousands)				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, net (in thousands)				$ 48,466,000	$ 48,763,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585

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