Document and Entity Information	9 Months Ended
	Sep. 30, 2011
Document and Entity Information [Abstract]
Entity Registrant Name	250 WEST 57TH ST ASSOCIATES L.L.C.
Entity Central Index Key	0000100412
Document Type	10-Q
Document Period End Date	Sep. 30, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company