The Town of Walpole, MA does give a variety of abatements, including, but not limited to low income, veterans, disability, blind, elderly, etc. They also will entertain your request for an abatement of taxes due to overvaluation of assessed value. Applications can be date sensitive, and you will likely have to prove eligibility. Visit the Town of Walpole web site at http://www.walpole-ma.gov/Assessors.htm
for answers to many of your questions, download forms, or just call their office during regular business hours. You will find the staff most helpful.