Mass. Gen. Laws ch. 61A, § 5: Contiguous land under one ownership within more than one city or town

Section 5. Where contiguous land in agricultural, horticultural or agricultural and horticultural uses under one ownership is located in more than one city or town, compliance with the five-acre minimum area requirements of section four shall be determined on the basis of the entire area of such land and not on the basis of the land area which falls within the bounds of any particular city or town.