It is unlawful for any person to use or occupy any part of any street, sidewalk or alley in the city for the purpose of keeping, storing or displaying any goods, wares or merchandise, signs or advertisements, crates, boxes, refuse or rubbish, or otherwise to encroach upon any part of any such street, sidewalk or alley, in the conduct of any business or pursuit, but all such streets, sidewalks and alleys shall at all times be kept clear and unobstructed; provided, that in the case of buildings or other works, the superintendent of public works may issue a permit for temporary obstructions on such conditions as he may prescribe, and upon the condition that upon the completion of such work all materials or other obstructions shall be removed; and except in cases where permits shall have been issued for gasoline pumps or other structures, which may remain until otherwise ordered by the city council.
(Prior code § 21.15)