Mass. Gen. Laws ch. 186A § 3
Within 30 days of the foreclosure, the foreclosing owner shall post in a prominent location in the building in which the rental housing unit is located a written notice stating the names, addresses, telephone numbers and telephone contact information of the foreclosing owner, the building manager or other representative of the foreclosing owner responsible for the management of such building and stating the address to which rent and use and occupancy charges shall be sent. This requirement shall be satisfied if the foreclosing owner or someone acting on his behalf has: (i) posted in a prominent location in the building; (ii) mailed by first class mail to each unit; (iii) and slid under the door of each unit in the building a document stating the names, addresses, and telephone contact information of the foreclosing owner, the building manager or other representative of the foreclosing owner responsible for the management of such building and stating the address to which rent and use and occupancy charges shall be sent.
A foreclosing owner shall not evict a tenant for actions that constitute just cause unless the foreclosing owner has delivered to each tenant at the time of delivery of written notice pursuant to this section, a written disclosure of the tenant's right to a court hearing prior to eviction.
Mass. Gen. Laws ch. 186A, § 3