(1) Any taxing district that objects to the apportionment district, the duration of the apportionment, the manner of apportionment, or the propriety of cost items established by the public improvement ordinance of the sponsor may, within thirty days after mailing of the ordinance, petition for review thereof by the state board of tax appeals. The state board of tax appeals shall meet within a reasonable time, hear all the evidence presented by the parties on matters in dispute, and determine the issues upon the evidence as may be presented to it at the hearing. The board may approve or deny the public improvement ordinance as enacted or may grant approval conditioned upon modification of the ordinance by the sponsor. The decision by the state board of tax appeals shall be final and conclusive but shall not preclude modification or discontinuation of the public improvement.
(2) If the sponsor modifies the public improvement ordinance as directed by the board, the public improvement ordinance shall be effective without further hearings or findings and shall not be subject to any further appeal. If the sponsor modifies the public improvement ordinance in a manner other than as directed by the board, the public improvement ordinance shall be subject to the procedures established pursuant to RCW 39.88.040