It shall be the duty of the Mayor or his authorized agent to prevent bill posting, defacing, mutilating, or injuring any portion of the market buildings in any manner whatsoever. No person may post bills, deface, mutilate, or injure any portion of said market buildings. It shall be unlawful:to deface any portion of a market house or any part thereof; to throw or cause to be thrown any stone, brick, or any other missile upon or against the market house; to place any trestle or lumber on the roof of the market house; or to climb or to walk upon the roof. City Code, 1966, art. 16, §3(exc 2nd sen., 2nd cl.), §17(h)(1st sen.) 1976/83, art. 16, §2(o)(exc 2nd sen., 2nd cl.), §7(g)(1st sen.) Ord. 83-1074