No steps or stairways, open or enclosed, shall be erected upon or attached to the front or side of any building in any district, but nothing herein shall bar front or side porch steps and front or side entrance to the first floor only.
No stand of any kind for the conduct of business shall be permitted.
No structure or building of a portable nature, vehicle of any kind, trailer, boat or ship shall be permitted to be located or operated in any district for dwelling purposes or for the purpose of selling food, merchandise or commodities of any kind. No such portable structure, building, vehicle or boat or ship shall be permitted for any other reason without the prior approval of the Board of Adjustment.