The proponents of a planned business district shall prepare and submit a preliminary development plan to the planning and zoning board for its inspection and review, upon which plan the planning and zoning board shall advertise and hold a public hearing. This preliminary plan of the property to be zoned as a district C-P, drawn to scale, shall show the boundaries of the property proposed to be zoned, the existing topography with contour intervals not greater than five feet, unless waived by the planning and zoning board and the proposed arrangement of stalls and number of cars, entrance and exit driveways, and their relationship to existing and proposed streets, alleys, and other public ways or public property, and any additional information required by the planning and zoning board. The plan shall show sufficient proposed control grade to interpret the intent of the developer. The preliminary plan shall also show the development of adjacent properties within 200 feet, including the location and type of buildings and structures thereon. If the planned business district is proposed in an unplatted area, the preliminary plan shall be accompanied by a plat, giving the full legal description of the boundaries of the property to be included in the areas to be zoned as a planned business district.