'Gateway entrance to Greenwich?' Developer details proposed large-scale apartment building FacebookTwitterEmail The Honda dealership on Milbank Avenue in Greenwich, Conn., photographed on Thursday, Feb. 25, 2021. An application for a residential development has been submitted for 290-294 Mason St. and 275-321 Mason St.File / Tyler Sizemore / Hearst Connecticut Media GREENWICH — Developers seeking to build a large new residential building on lower Mason Street say it would blend into the site, offer public amenities and serve as a gateway to that part of Greenwich. Members of the Planning and Zoning Commission, however, want more information about the plan and assurances of how the project would benefit central Greenwich.