FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Mortgages payable \| Minimum
Fair value of financial instruments
Discount rate used to estimate fair value of mortgages payable (as a percent)	4.85%	4.54%
Mortgages payable \| Maximum
Fair value of financial instruments
Discount rate used to estimate fair value of mortgages payable (as a percent)	5.00%	5.15%
Book value
Fair value of financial instruments
Unsecured revolving lines of credit	$ 164,000,000	$ 30,000,000
Book value \| Mortgages payable
Fair value of financial instruments
Mortgages payable	231,105,000	315,631,000
Fair value \| Mortgages payable
Fair value of financial instruments
Mortgages payable	$ 231,250,000	$ 317,338,000

Represents the fair value portion of liabilities pertaining to unsecured revolving lines of credit.

No definition available.

Name:	cmct_UnsecuredRevolvingLinesOfCreditFairValueDisclosure
Namespace Prefix:	cmct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611

+ Details

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration