Section 28-118.3.1. Change of occupancy or use

No building, open lot or
  portion thereof hereafter altered so as to  change  from  one  occupancy
  group  to  another,  or  from one zoning use group to another, either in
  whole or in part, shall  be  occupied  or  used  unless  and  until  the
  commissioner  has  issued a certificate of occupancy certifying that the
  alteration work for which the  permit  was  issued  has  been  completed
  substantially in accordance with the approved construction documents and
  the  provisions of this code and other applicable laws and rules for the
  new occupancy or use.