NEW YORK--(BUSINESS WIRE)--Fitch Ratings has assigned the following ratings to the Floater Certificates and Residual Certificates of the Tender Option Bond Trust series listed below: --Floater Certificates Series 2015-ZF2061 'AA/F1'; Stable Outlook; --Residual Certificates Series 2015-ZF2061 'AA'; Stable Outlook; --Floater Certificates Series 2015-ZF2063 'AA/F1'; Stable Outlook; --Residual Certificates Series 2015-ZF2063 'AA'; Stable Outlook; --Floater Certificates Series 2015-ZF2069 'AA+/F1';