ORGANIZATION (Details) $ / shares in Units, $ in Thousands							3 Months Ended	6 Months Ended		13 Months Ended	66 Months Ended
	Nov. 01, 2019	Feb. 13, 2018 USD ($) shares	Jul. 14, 2017 USD ($) shares	Jul. 31, 2014 shares	Apr. 02, 2014 shares	Jul. 03, 2013 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2020 USD ($) investment property subsidiary shares	Jun. 30, 2019 USD ($) shares	Aug. 11, 2014 USD ($) shares	Jun. 30, 2020 USD ($) investment property subsidiary shares	Feb. 19, 2020	Nov. 14, 2013 shares
Organizational Structure [Line Items]
Number of wholly owned subsidiaries | subsidiary								3			3
Period of termination of advisory agreement without cause or penalty	30 days
Number of investments in an unconsolidated entity | investment								2			2
Number of investments in equity securities | investment								2			2
Proceeds from issuance of common stock, dividend reinvestment plan | $											$ 10,000
Issuance of common stock | $							$ 448	$ 135	$ 1,347		9,200
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
Separate Private Transactions
Organizational Structure [Line Items]
Issuance of common stock | $								$ 4,200
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 | Class A
Organizational Structure [Line Items]
Issuance of common stock (in shares)							24,324	6,552	73,549		833,490
Shares, dividend reinvestment plan (in shares)											730,193
Issuance of common stock | $							$ 1		$ 1
Common Stock | Class T
Organizational Structure [Line Items]
Issuance of common stock (in shares)							21,846	6,290	65,825		164,618
Shares, dividend reinvestment plan (in shares)											340,127
Issuance of common stock | $							$ 1		$ 1
Common Stock | Private Placement
Organizational Structure [Line Items]
Issuance of common stock (in shares)										3,619,851
Common Stock | Private Placement | Class A | Willowbrook Capital Group LLC
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
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 | Class A
Organizational Structure [Line Items]
Issuance of common stock (in shares)											11,977,758
Common Stock | IPO | Class T
Organizational Structure [Line Items]
Issuance of common stock (in shares)											11,537,701
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			2
Office Building
Organizational Structure [Line Items]
Number of real estate properties | property								3			3
Apartment Building
Organizational Structure [Line Items]
Number of real estate properties | property								1			1
Pacific Oak Capital Advisors, LLC
Organizational Structure [Line Items]
Period of termination of renewal of advisory agreement without cause or penalty	90 days
POSOR I
Organizational Structure [Line Items]
Merger, common stock conversion ratio												96.43%
KBS Strategic Opportunity Limited Partnership II
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%