(1)
(a) Before submitting a final plat for approval, the subdivider may submit, or the approving authority may require that the subdivider submit, a preliminary plat. It shall be clearly marked “preliminary plat” and, except as provided in par. (d), shall be in sufficient detail to determine whether the final plat will meet layout requirements. Subject to par. (d), within 90 days, the approving authority, or its agent authorized to approve preliminary plats, shall take action to approve, approve conditionally, or reject the preliminary plat and shall state in writing any conditions of approval or reasons for rejection, unless the time is extended by agreement with the subdivider. Failure of the approving authority or its agent to act within the 90 days, or extension thereof, constitutes an approval of the preliminary plat.