DALLAS (Standard&Poor's) Sept. 6, 2007-- Standard&Poor's Ratings Services raised its rating to 'AA-' from 'A+' on the City of Cedar Hill, Texas' GO debt based on the city's continued substantial economic expansion and its consistently strong financial position and performance. In addition, Standard&Poor's assigned its 'AA-' rating to the city's series 2007 GO bonds. The outlook is stable. "The raised rating reflects the city's stable and expanding economic base, as well as strong growth in assessed values, which have increased an average of 10% annually since fiscal 2003, to a certified $3 billion for fiscal 2008," said Standard&Poor's credit analyst Brian Marshall. "We expect management will maintain the city's financial position through