No person shall place, keep or maintain any auto trailer on any land within the city without the express permission of the owner of such land, and no person shall allow, suffer or permit any auto trailer to be placed, kept or maintained on any land owned or controlled by him, except in an auto trailer camp for which a permit has been issued by the Health Department; provided, that the occupant of any single-family dwelling may allow not more than one auto trailer of a nonpaying guest to be placed, kept or maintained thereon for a period not exceeding three months in any period of 12 months by securing a permit and otherwise complying with the provisions of this article relating thereto.
('71 Code, § 1171.02) Penalty, see § 101.99