Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Reclassification and Restricted Cash) (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($) property
Accounting Policies [Abstract]
Impairment of real estate \| $	$ 0	$ 0	$ 0
Restricted cash and cash equivalents \| $	$ 0	0
Accounting Standards Update 2016-02
Real Estate [Line Items]
Tenant reimbursement revenue \| $		$ 2,200,000	$ 3,100,000
Office Properties \| Disposed of by Sale
Real Estate [Line Items]
Number of real estate properties disposed \| property	1	1	12
Retail Property \| Disposed of by Sale
Real Estate [Line Items]
Number of real estate properties disposed \| property	1
Apartment Building \| Disposed of by Sale
Real Estate [Line Items]
Number of real estate properties disposed \| property	1