Morgan Stanley&Co. Inc. Trust floater certificates series 2006-2158, relating to Pennsylvania Housing Finance Agency single family mortgage revenue bonds series 2007-100A, are rated 'AA+/A-1+'. The long-term component of the rating is based on the underlying bond. The short-term component of the rating is based on a guarantee provided by Morgan Stanley and a liquidity facility provided by Morgan Stanley Municipal Funding Inc. until Dec. 5, 2008. Morgan Stanley&Co. Inc. Trust residual certificates Series 2006-2158, relating to Pennsylvania Housing Finance Agency single family mortgage revenue bonds series 2007-100A, are rated 'AA+'. The rating is based on the underlying bond.