Before the expiration of the year, the Planning Board shall, upon its initiative or upon the request of the organization responsible for the maintenance of the open space, call a public hearing upon 15 days' written notice to such organization and to the owner of the development, which hearing is to be held by the Planning Board. At such hearing the organization and the owners of the development shall show cause why such maintenance by the Township shall not, at the election of the Township, continue for a succeeding year.