Sec. 6-29. Sidewalks; obstruction; removal; special permit.
   (a)   No sidewalks shall be obstructed in the course of building construction or alteration without a special permit from the Manager.
   (b)   Whenever the removal of a sidewalk is required, in such work, a special permit from the Manager shall be obtained. (M.C. 1963, § 22.503.)