Provide for agreement that, if the Township is required to perform any maintenance work pursuant to the subsection above, such purchasers would pay the cost thereof and that the same shall be a lien upon their properties until such cost has been paid; provided, that the developer shall be responsible for the formation of the homeowners' association of which the developer, or if the developer is not the owner of the development, then such owner shall be a member until all of the lots of record are sold. Other equivalent provisions to assure adequate perpetual maintenance may be permitted if approved by the Board of Supervisors. Assurance that such covenants or equivalent provisions will be evidenced by the recordation in the office of Recorder of Deeds of a perpetual maintenance of facilities as prescribed hereinabove and identifying the tract and each lot therein. The declaration shall be included in the deed or other instrument of conveyance of each lot of record and shall be made binding on all purchasers; provided, that such declaration may, as to subsequent conveyance other than the initial conveyance of each lot of record, be incorporated by reference in the instrument of conveyance.