Only accessory storage buildings defined in DPMC § 18.61.020(A) shall be permitted as accessory storage containers on property in any residential zone of the city, or on any property within the city the primary use of which is residential. Cargo containers, railroad cars, truck vans, converted mobile homes, travel trailers, recreational vehicles, bus bodies, vehicles, and similar prefabricated items and structures originally built for purposes other than the storage of goods and materials are not permitted to be used as accessory storage buildings on property zoned residential or on property the primary use of which is residential.