Failure to so act within said period shall be deemed to be a grant of tentative approval of the development plan as submitted. If tentative approval is granted subject to conditions, the landowner may, within 30 days after receiving a copy of the official written report, notify the Township Supervisors of his refusal to accept all said conditions, in which case the Township Supervisors shall be deemed to have denied tentative approval of the development plan. If the landowner does not, within said period, notify the Township Supervisors of his refusal to accept all said conditions, tentative approval of the development plan, with all stated conditions, shall stand as granted.