Boats, motor homes, camp trailers, travel trailer, fifth wheels, pickup campers, utility trailers, and snowmobiles as defined herein may be stored in all yard areas within the R-1, R-2, R-3 and R-4 districts, and only within the side and rear yards in the R-S-20, R-S-12 and R-S-1 districts. All storage areas shall be surfaced with all-weather materials such as asphalt, brick, stone, concrete or gravel. Additionally, the storage and parking of said items in residential districts shall, at all times, comply with the parking conditions in PMC 25.185.030(4). Bona fide guests of the occupants of the premises may temporarily park on driveways for periods not to exceed 10 days in any 60-day period. [Ord. 3354 § 2, 1999; Code 1970 § 25.78.140.]