In the event tentative approval is granted subject to conditions, the landowner may, within 30 days after receiving a copy of the official written communication of the Borough of Chambersburg, notify the Borough of his refusal to accept all said conditions, in which case the Borough shall be deemed to have denied tentative approval of the development plan. In the event the landowner does not, within said period, notify the governing body of his refusal to accept all said conditions, tentative approval of the development plan, with all said conditions, shall stand as granted.