Section 28-503.1. General

A sign with a surface area greater than 200 square
  feet (19 m{2}) that is erected, maintained, attached,  affixed,  painted
  on,  or  in  any  other  manner represented on a building or premises in
  violation of the zoning resolution, this code, the 1968 building code or
  rules adopted pursuant  thereto  is  hereby  declared  to  be  a  public
  nuisance.  The  commissioner  may,  after  notice and hearing, order the
  removal of  such  illegal  sign  or  its  sign  structure  or  both,  as
  hereinafter provided.