The Board of Appeals shall refer to the Rockland County Planning Board for its recommendation all matters within the provisions of Article 12B, §§ 239-i and 239-m, of the General Municipal Law, which includes real property lying within 500 feet from the boundary of any city, Village, or town, or from the boundary of any existing or proposed county or state parkway, thruway, expressway, road, highway or from the existing or proposed right-of-way of any stream or drainage channel owned by the county or for which the county has established channel lines, or from the existing or proposed boundary of any county or state owned land on which a public building or institution is situated, and any special permit or variance affecting such use or property within a distance of 500 feet. The Rockland County Planning Board shall render its decision within 30 days of referral or within an extended period if agreed upon. If the Rockland County Planning Board fails to report within such period of 30 days or such longer period as has been agreed upon by it and the Board of Appeals, the Board of Appeals may act without such report. If the Rockland County Planning Board disapproves the proposal, or recommends modifications thereof, the Board of Appeals shall not act contrary to such disapproval or recommendation except by a vote of a majority plus one of all members thereof and after the adoption of a resolution fully setting forth the reasons for such contrary action. Within 30 days after final action by the Board of Appeals, a report shall be filed of the final action it has taken with the County Planning Board which had made the recommendations, modifications or disapproval.