Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Mar. 11, 2021	Jun. 30, 2020
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-13610
Entity Registrant Name	CIM COMMERCIAL TRUST CORPORATION
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	75-6446078
Entity Address, Address Line One	17950 Preston Road,
Entity Address, Address Line Two	Suite 600,
Entity Address, City or Town	Dallas,
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75252
City Area Code	(972)
Local Phone Number	349-3200
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 126.5
Entity Common Stock, Shares Outstanding		14,827,410
Documents Incorporated by Reference	Part III of this Annual Report on Form 10-K incorporates by reference specified portions of CIM Commercial Trust Corporation’s Proxy Statement for its 2021 Annual Meeting of Stockholders, which the registrant anticipates will be filed with the Securities and Exchange Commission no later than April 30, 2021.
Entity Central Index Key	0000908311
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Common Stock, $0.001 Par Value | Nasdaq Global Market
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, $0.001 Par Value
Trading Symbol	CMCT
Security Exchange Name	NASDAQ
Common Stock, $0.001 Par Value | Tel Aviv Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, $0.001 Par Value
Trading Symbol	CMCT-L
Series L Preferred Stock, $0.001 Par Value | Nasdaq Global Market
Entity Information [Line Items]
Title of 12(b) Security	Series L Preferred Stock, $0.001 Par Value
Trading Symbol	CMCTP
Security Exchange Name	NASDAQ
Series L Preferred Stock, $0.001 Par Value | Tel Aviv Stock Exchange
Entity Information [Line Items]
Title of 12(b) Security	Series L Preferred Stock, $0.001 Par Value
Trading Symbol	CMCTP