Below is the list of emails (formatted so you can copy and paste) and phone numbers of the elected officials, City Councilors, and the Mayor.
Mayor Marty Walsh 617-635-4500 mayor@boston.gov
State elected officials:
Boston City Councilors:
Comments can also be left on the BPDA Winthrop Square page.
http://www.bostonplans.org/projects/development-projects/115-winthrop-square