Mass. Gen. Laws ch. 265, § 56
(iv) all real property, including any right, title and interest in the whole of any lot or tract of land and any appurtenances or improvements thereto, which is used in any manner or part to commit or to facilitate any violation of section 50 or 51.
No forfeiture under this section shall extinguish a perfected security interest held by a creditor in a conveyance or in any real property at the time of the filing of the forfeiture action.