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Recent Real Estate Transactions (Disposals of Properties) (Details)	1 Months Ended			12 Months Ended
	Apr. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Feb. 28, 2017 USD ($)	Dec. 31, 2018 USD ($) Property	Dec. 31, 2017 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				$ 34,900,000
Gain on sale of real estate assets				12,200,138	$ 2,623,469
Residential Properties [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property				12,600,000	9,800,000
Gain (loss) on sale of property				$ 988,000	$ 735,000
Number of properties | Property				33	23
Residential Properties [Member] | Port of San Diego Complex [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property				$ 24,800,000
Gain (loss) on sale of property				10,000,000
Residential Properties [Member] | Yucca Valley Retail Center [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property				7,800,000
Gain (loss) on sale of property				1,400,000
Residential Properties [Member] | Pacific Oaks Plaza [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property				3,900,000
Gain (loss) on sale of property				$ (232,000)
Residential Properties [Member] | Shoreline Medical Building [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property	$ 8,200,000
Gain (loss) on sale of property	$ 1,300,000
Residential Properties [Member] | Regatta Square Retail Center [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property		$ 3,000,000
Gain (loss) on sale of property		$ 756,000
Residential Properties [Member] | Rangewood Medical Office Building [Member]
Real Estate Properties [Line Items]
Proceeds from sale of property			$ 2,200,000
Gain (loss) on sale of property			$ 170,000
Residential Properties [Member] | Forty-Five Dubose Model Homes [Member]
Real Estate Properties [Line Items]
Number of properties | Property				45
Total purchase price of property acquired				$ 17,326,915

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