NEW YORK--(BUSINESS WIRE)--Fitch Ratings has upgraded five classes and affirmed 17 classes of Banc of America Commercial Mortgage Trust (BACM) commercial mortgage pass-through certificates series 2007-3. A detailed list of rating actions follows at the end of this press release. KEY RATING DRIVERS The upgrades are a result of increased credit enhancement due to additional paydown since Fitch's last rating action. Fitch modeled losses of 7.5% of the remaining pool; expected losses on the origina