Mass. Gen. Laws ch. 60 § 47
Whoever has a title to land under a sale for nonpayment of taxes or other assessment and is a resident of the town where such land lies shall file with the treasurer thereof and in the registry of deeds a statement of his residence and place of business, with the street and number, if any. Such person, who is not a resident of such town or who removes therefrom, shall appoint an agent residing therein, or in the town where the tax deed is recorded, authorized to release such land. He shall also file the statement above required in which he shall also state the name of such agent and his residence and place of business, with the street and number, if any. Whenever a person holding a tax title changes his residence or place of business or agent, he shall file a new certificate. Tender of payment to, and service of process upon, such agent shall be a sufficient tender to, or service upon, the holder of such tax title.
Mass. Gen. Laws ch. 60, § 47