NEW YORK--(BUSINESS WIRE)--Fitch Ratings upgrades two classes of Lone Star Funds (LSTAR) commercial mortgage pass-through certificates series 2011-1. A full list of rating actions follows at the end of this press release. KEY RATING DRIVERS The upgrades are due to additional paydown and amortization since Fitch's last rating action. The attributes of this transaction are materially different from recent Fitch-rated conduit transactions. The collateral at issuance featured high initial loan to v