ORGANIZATION (Details) $ / shares in Units, $ in Thousands							12 Months Ended			13 Months Ended	36 Months Ended	60 Months Ended
	Nov. 01, 2019	Feb. 13, 2018 USD ($) shares	Jul. 14, 2017 USD ($) shares	Jul. 31, 2014 USD ($) shares	Apr. 02, 2014 USD ($) shares	Jul. 03, 2013 $ / shares shares	Dec. 31, 2019 USD ($) instrument shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Aug. 11, 2014 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2019 USD ($) instrument shares	Dec. 31, 2019 subsidiary	Dec. 31, 2019 investment	Dec. 31, 2019 property	Nov. 14, 2013 shares
Organizational Structure [Line Items]
Number of wholly owned subsidiaries | subsidiary													3
Number of wholly owned subsidiaries that lease parent properties | subsidiary													2
Period of termination of advisory agreement without cause or penalty	30 days
Number of investments in unconsolidated joint venture							2					2		1
Number of investments in equity securities | investment														1
Proceeds from issuance of common stock | $							$ 0	$ 17,184	$ 70,090
Proceeds from issuance of common stock, dividend reinvestment plan | $												$ 7,400
Amount exempt from registration requirements in separate private transactions | $							4,200
Issuance of common stock | $							$ 2,218	$ 19,995	$ 71,916
Private Placement
Organizational Structure [Line Items]
Proceeds from issuance of common stock | $										$ 32,200
IPO
Organizational Structure [Line Items]
Proceeds from issuance of common stock | $											$ 228,600
Proceeds from issuance of common stock, dividend reinvestment plan | $												$ 9,800
Common Stock
Organizational Structure [Line Items]
Issuance of common stock (in shares)						21,739
Shares issued (in dollars per share) | $ / shares						$ 9.20
Common Stock | Common Class A
Organizational Structure [Line Items]
Issuance of common stock (in shares)							121,175	1,100,169	2,641,090
Issuance of common stock, shares, dividend reinvestment plan (in shares)												718,962
Issuance of common stock | $							$ 1	$ 11	$ 27
Common Stock | Common Class T
Organizational Structure [Line Items]
Issuance of common stock (in shares)							108,704	984,685	4,822,456
Issuance of common stock, shares, dividend reinvestment plan (in shares)												107,945
Issuance of common stock | $							$ 1	$ 10	$ 48
Common Stock | Private Placement
Organizational Structure [Line Items]
Issuance of common stock (in shares)										3,619,851
Common Stock | IPO
Organizational Structure [Line Items]
Shares registered in primary offering (in shares)																100,000,000
Shares registered for sale under dividend reinvestment plan (in shares)																80,000,000
Common Stock | IPO | Common Class A
Organizational Structure [Line Items]
Issuance of common stock (in shares)											11,977,758
Issuance of common stock, shares, dividend reinvestment plan (in shares)												723,641
Common Stock | IPO | Common Class T
Organizational Structure [Line Items]
Issuance of common stock (in shares)											11,537,701
Issuance of common stock, shares, dividend reinvestment plan (in shares)												333,841
Common Stock | IPO | Maximum
Organizational Structure [Line Items]
Stock offering, shares authorized for issuance (in shares)																180,000,000
Hotel
Organizational Structure [Line Items]
Number of real estate properties | property															2
Office Building
Organizational Structure [Line Items]
Number of real estate properties | property															3
Apartment Building
Organizational Structure [Line Items]
Number of real estate properties | property															1
Retail Property
Organizational Structure [Line Items]
Number of real estate properties | property															1
Willowbrook Capital Group LLC | Common Stock | Private Placement | Common Class A
Organizational Structure [Line Items]
Issuance of common stock (in shares)		10,935	214,175	120,106	120,106
Issuance of common stock | $		$ 100	$ 2,000	$ 1,000	$ 1,000
Pacific Oak Capital Advisors, LLC
Organizational Structure [Line Items]
Period of termination of renewal of advisory agreement without cause or penalty	90 days
Operating Partnership
Organizational Structure [Line Items]
Partnership interest in Operating Partnership							0.10%
Partnership interest in the Operating Partnership and is its sole limited partner							99.90%