The area or parcel of land for a permitted use shall not be less than that required to provide a site adequate for the main and accessory buildings, off-street parking and other accessory buildings, off-street parking and other accessory uses, set backs, yards and open spaces to accommodate the facility and maintain the character of the neighborhood. The specific size of an area or parcel of land required for a special use shall be approved by the Planning Commission at the time of zoning, pursuant to Section 1181.05.