The Newtown Planning and Zoning Commission has rejected a proposal from a developer for a 27-unit apartment building on a 1.6 acre residential lot.  Brookfield developer Robert Sherwood wanted to convert a single-family home on historic South Main Street, between a stretch of Victorian and Colonial homes on one side and commercial buildings on the other.  The three-story apartment building would have been screened with 10 foot evergreens, with 50 parking spaces on the property.  Neighbors raised concerns about the character of the building, the density, traffic impacts and school-age kids adding to enrollment in the district.