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INVESTMENT IN REAL ESTATE - Acquisitions Narrative (Details) - property | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Business Combinations [Abstract] |  |
Number of property acquisitions (in properties) | 0 | 0
Number of property acquisition disposed (in properties) | 0 |

X
- Definition Number Of Business Disposed + References No definition available. + Details
Name: | cmct_NumberOfBusinessDisposed
Namespace Prefix: | cmct_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_BusinessCombinationsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
Name: | us-gaap_NumberOfBusinessesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration