Mass. Gen. Laws ch. 251, § 17: Venue

Section 17. An initial application shall be made to the superior court for the county in which the agreement provides the arbitration hearing shall be held or, if the hearing has been held, in the county in which it was held. Otherwise the application shall be made in the county where the adverse party resides or has a place of business or, if he has no residence or place of business in this state, to the superior court for any county. All subsequent applications shall be made to the court hearing the initial application unless the court otherwise directs.