If the Pinelands Commission disapproves an application for development previously approved by an approving authority, such approval shall be revoked by the approving authority within 30 days and the approving authority shall thereafter deny approval of the application. If the commission approves the decision of an approving authority subject to conditions, the approving authority which had previously approved the application shall, within 30 days, modify its approval to include all conditions imposed by the commission and, if final approval of the application is required, shall grant final approval only if the application for approval demonstrates that the conditions specified by the commission have been met by the applicant.