In a residential district, one commercial vehicle which is owned by the occupant of the dwelling, and which is not more than twenty feet (20') in length when parked, nor in excess of three- fourths (3/4) ton in capacity, may be parked in the open on a lot within the buildable area or in the back yard not closer than six feet (6') to any building on the neighboring property, or not closer than three feet (3') to any property line, or may be stored in a garage, carport or screen shelter, or similar structure designed so as to substantially conceal the vehicle from the view of adjoining property owners, if parked in the rear yard area. (2005 Zoning Code)