CHICAGO--(BUSINESS WIRE)--Fitch Ratings has affirmed the City of Miami, FL Department of Off-Street Parking's (DOSP) approximately $68.7 million of outstanding series 1998A and 2009 A & B parking system revenue bonds at 'A'. The Rating Outlook is Stable. KEY RATING DRIVERS The affirmation reflects the DOSP's continued revenue growth and rate-making flexibility that has allowed the authority to have generated debt service coverage ratios (DSCR) at or above 2.0x historically. The DOSP's relat