Section 44J. The agreement made under section forty-four C, or any amendment to such an agreement, may contain provisions authorizing any member city or town to sell, lease or license to the regional refuse disposal district any refuse disposal facility and any land appurtenant thereto or used in connection therewith or any other property useful for the purposes of the district, and any such city or town may authorize such sale, lease or license accordingly, notwithstanding the provisions of section three of chapter forty or any other provisions of law to the contrary. In case of a sale, the price and time or times of payment and the method by which the cities and towns other than the selling city or town shall be assessed for such payment shall be set forth in the agreement or amendment; but in no case shall payments be made which shall extend over a period in excess of twenty years. In the case of a lease or license, the rental or license fee and terms of payment and assessment shall be set forth in the agreement or amendment. The lease or license may be for a term not in excess of twenty years, and may contain provisions for the extension of the lease or license for an additional term not in excess of twenty years at the option of the regional refuse disposal district committee.