If you are dissatisfied with the decision of the Board of Assessors, you may file an appeal to the Appellate Tax Board. The ATB is located at 100 Cambridge Street, Suite 200, Boston, MA 02114. The telephone number is (617) 727-3100 and the fax number is (617) 727-6234. You can also visit them on-line at http://www.mass.gov/atb/