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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Value of property contributed in noncash investing and financing activities.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before accumulated deprecation and depletion of additions or improvements to real estate held for productive use. Examples include, but are not limited to, walkways, driveways, fences, and parking lots.

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No definition available.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of accumulated depreciation for real estate owned (REO).

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Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants.

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REAL ESTATE ASSETS (Details) - USD ($)		3 Months Ended	12 Months Ended
REAL ESTATE ASSETS (Details) - USD ($)	Jan. 31, 2018	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Line Items]
Payments to acquire real estate and real estate joint ventures			$ 456,100,000
Buildings, Gross			102,375,000	$ 92,349,000
Tenant improvements			4,501,000	4,160,000
Land improvements			484,000	484,000
Total real estate assets			107,360,000	96,993,000
Less: accumulated depreciation			(8,681,000)	(3,970,000)
Total investment in real estate, net			98,679,000	93,023,000
Finite-lived intangibles assets, net			8,070,000	10,954,000
Depreciation and amortization expense for real estate assets			$ 7,600,000	7,000,000.0	$ 0
In-place lease intangibles
Real Estate [Line Items]
Intangible assets, weighted average useful lives (in years)			45 months
Finite-lived intangible assets, gross			$ 11,389,000	10,866,000
Less: accumulated amortization			(5,927,000)	(3,076,000)
Finite-lived intangibles assets, net			$ 5,462,000	7,790,000
Above-market lease intangibles
Real Estate [Line Items]
Intangible assets, weighted average useful lives (in years)			45 months
Finite-lived intangible assets, gross			$ 3,623,000	3,623,000
Less: accumulated amortization			(1,015,000)	(459,000)
Finite-lived intangibles assets, net			2,608,000	3,164,000
Lease intangibles
Real Estate [Line Items]
Estimated amortization expense, year one			8,100,000
Estimated amortization expense, year two			8,100,000
Estimated amortization expense, year three			8,100,000
Estimated amortization expense, year four			8,100,000
Estimated amortization expense, year five			8,100,000
Tall Tower
Real Estate [Line Items]
Payments to acquire real estate and real estate joint ventures	$ 110,000,000.0		$ 110,000,000.0
Field office
Real Estate [Line Items]
Payments to acquire real estate and real estate joint ventures				$ 1,300,000
A-Street Building
Real Estate [Line Items]
Payments to acquire real estate and real estate joint ventures		$ 9,200,000
Tenant improvements
Real Estate [Line Items]
Property and equipment estimated useful lives (in years)			15 years
Land improvements
Real Estate [Line Items]
Property and equipment estimated useful lives (in years)			15 years
Minimum
Real Estate [Line Items]
Property and equipment estimated useful lives (in years)			10 years
Minimum \| Buildings
Real Estate [Line Items]
Property and equipment estimated useful lives (in years)			20 years
Maximum
Real Estate [Line Items]
Property and equipment estimated useful lives (in years)			30 years
Maximum \| Buildings
Real Estate [Line Items]
Property and equipment estimated useful lives (in years)			30 years