It is unlawful to mark with ink, paint, chalk or other substance, or post hand bills on, or in any other manner deface or injure any school building or structure used or usable for school purposes within the city, or to mark, deface or injure fences, trees, lawns, or fixtures appurtenant to or located on the site of such buildings, or to post hand bills on such fences, trees or fixtures, or to place a sign anywhere on any such site.
('72 Code, § 910:00) Penalty, see § 10.99