The Belmont Board of Assessors has decided to appeal the Massachusetts Appellate Tax Board’s decision to award the Belmont Country Club a “significant” property tax abatement. “Since I’ve been on the Board of Assessors, which is June of this year, discussing what to do in light of this decision has been one of our principal activities,” said Board of Assessors Chair Roy Epstein. According to court documents, the state’s Appellate Tax Board handed down a decision in February that resulted…