Document And Entity Information	3 Months Ended
	Mar. 31, 2013
Entity Registrant Name	BCTC V ASSIGNOR CORP
Entity Central Index Key	0001267426
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding	1,000
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2013