Once the estate of 19th-century “gentleman farmer and writer” Donald Grant Mitchell ’41, Westville — the commercial center and neighborhood a bike ride down Whalley Avenue — is going through another transformation. Its new “Connecticut Main Street Community” designation, given by Connecicut Main Street Center, will assist the Westville Renaissance Alliance to further develop the historic community, said State Rep. Pat Dillon, who assisted the residents in obtaining necessary state funding. The designation will also ensure a full-time executive director for the Westville Renaissance Alliance.