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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Ground Leases (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Variable Interest Entities
Total revenues	$ 22,448,000	$ 20,414,000	$ 20,719,000	$ 21,155,000	$ 20,270,000	$ 19,570,000	$ 19,752,000	$ 19,534,000	$ 84,736,000	$ 79,126,000	$ 75,916,000
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Restricted cash					1,106,000					1,106,000
Variable Interest Entity, Not Primary Beneficiary
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Restricted cash	0								0
Variable Interest Entity, Not Primary Beneficiary | Ground lease rental income
Variable Interest Entities
Total revenues									1,597,000	3,357,000	3,702,000
Variable Interest Entity, Not Primary Beneficiary | Properties Located in Wheaton and Lakemoor, Illinois | Ground lease rental income
Variable Interest Entities
Total revenues									814,000	1,964,000	$ 2,175,000
Variable Interest Entity, Not Primary Beneficiary | The Briarbrook Village Apartments, Wheaton, Illinois | Restricted Cash
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Cash reserve balance					356,000					356,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Land Contract Purchase Price									$ 13,896,000
Units in Apartment Complex | item									348
Owner/ Operator Mortgage from Third Party									$ 67,444,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio | Restricted Cash
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Escrow deposit					$ 750,000					$ 750,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio | Land
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Carrying Amount and Maximum Exposure to Loss	$ 13,901,000								$ 13,901,000

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