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RECENT REAL ESTATE TRANSACTIONS (Disposals of Properties) (Details)					12 Months Ended
	Jul. 31, 2019 USD ($)	Jul. 01, 2019 USD ($)	May 08, 2019 USD ($)	Jan. 15, 2019 USD ($)	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property	Oct. 31, 2017 Property
Real Estate Properties [Line Items]
Number of properties | Property							1
Disposed of real estate assets with net carrying value					$ 25,100,000
Gain on sale of real estate assets					6,319,272	$ 12,200,138
Genesis Plaza
Real Estate Properties [Line Items]
Proceeds from sale of property		$ 2,900,000
Sale of percentage interest in real estate property		43.00%
Sale proceeds from real estate		$ 5,600,000
The Presidio
Real Estate Properties [Line Items]
Proceeds from sale of property	$ 12,300,000
Gain (loss) on sale of property	$ 4,500,000
Port of San Diego Complex
Real Estate Properties [Line Items]
Proceeds from sale of property						24,800,000
Gain (loss) on sale of property						10,000,000.0
Yucca Valley Retail Center
Real Estate Properties [Line Items]
Proceeds from sale of property						7,800,000
Gain (loss) on sale of property						1,400,000
Pacific Oaks Plaza
Real Estate Properties [Line Items]
Proceeds from sale of property						3,900,000
Gain (loss) on sale of property						(232,000)
Residential Properties
Real Estate Properties [Line Items]
Proceeds from sale of property			$ 875,000		14,600,000	12,600,000
Gain (loss) on sale of property			$ (93,000)		$ 1,200,000	$ 988,000
Number of properties | property					41	33
Residential Properties | Morena Office Center
Real Estate Properties [Line Items]
Proceeds from sale of property				$ 5,600,000
Gain (loss) on sale of property				$ 700,000

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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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The number of real estate properties owned as of the balance sheet date.

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