Change of use. Suitable residential buildings located on lots fronting on Main Street from Paradise Green to Stratford Avenue may be changed to office use without a zone change or an owner-occupancy requirement provided the residential character of the building is retained and, where appropriate, improved, subject to the approval of the Zoning Commission as a special permit under Section 7.3.4 of the Zoning Regulations. Site plan review shall be required for any of the uses permitted on Main Street with the exception of one, two, and three family dwellings.