NEW YORK--(BUSINESS WIRE)--Fitch Ratings has upgraded one, downgraded one, and affirmed 10 classes of Bear Stearns Commercial Mortgage Securities Trust commercial mortgage pass-through certificates series 2005-PWR8 (BSCMS 2005-PWR8). A full list of rating actions follows at the end of this press release. KEY RATING DRIVERS The upgrade is the result of significant deleveraging of the transaction due to $925.8 million in loan repayments since the last rating action. The downgrade reflects a great