NEW YORK–(BUSINESS WIRE)–Fitch Ratings has downgraded one class and affirmed 16 classes of Bear Stearns Commercial Mortgage Securities Trust (BSCMS) commercial mortgage pass-through certificates, series 2007-Top26. A detailed list of rating actions follows at the end of this press release. KEY RATING DRIVERS The downgrade of class A-M reflects higher modeled losses on both the specially serviced loans, as well as several of the largest loans remaining in the trust. Fitch has affirmed classes