Only one portable storage unit may be placed upon any residential property at one time. Portable storage units shall not have a footprint exceeding 130 square feet or a height of more than eight feet. Portable storage units shall not be placed forward of the front line of the principal residential structure on the lot, except in a driveway, and then as far from the street as practicable. Portable storage units shall be set back at least five feet from any boundary line and at least five feet from any structure. The Codes Enforcement Officer is empowered to approve the location of the portable storage unit if there is no driveway, if the location is on a corner lot, or under circumstances where the rights of neighboring property owners may be adversely affected.