All motor vehicles parked in a front yard must have current license plates displayed. (3388,3465,3689) (U) It shall be unlawful to store any watercraft, utility trailer, or any nonvehicle-mounted camper shell or truck camper within the front yard of a residential use. No watercraft, utility trailer, shall be stored in the side yard. (3689) (V) All persons owning or occupying improved property within the City shall maintain the yards and exposed exterior surfaces such as exterior windows, doors, canopies, metal awnings, roofs, exhaust ducts, chimneys, painted surfaces, window screening, fences, screen walls, retaining walls, foundations, cooling devices, outdoor stairs, porches and railings, as visible from the adjacent rights-of-way, in a structurally sound condition that does not constitute a hazard and is impervious to moisture and weather elements. Yards and exposed exterior surfaces as visible from the adjacent rights-of-way shall also be maintained so as to not exhibit deterioration, disrepair, or blight constituting more than twenty (20) contiguous square feet, or more than ten percent (10%) of the area of any exposed individual plane surface unbroken by corners of angles. (3478) The provisions of this Section may be applied cumulatively or separately for purposes of enforcement. (2824)