Section 27-123. Alterations involving high hazard occupancies

Any building
  erected prior to the  effective  date  of  this  code  (December  sixth,
  nineteen  hundred sixty-eight) and complying with section 27-117 of this
  article  may  be  utilized  for  new  high  hazard  occupancies  without
  compliance  with  article  two  of  subchapter  six  of  this chapter on
  condition that the building or building section  for  such  high  hazard
  occupancy  be  provided  with an approved one source automatic sprinkler
  system complying with the provisions of  subchapter  seventeen  for  B-1
  occupancies  regardless  of  the  area  thereof.  Existing  high  hazard
  occupancies in structures erected prior to the effective  date  of  this
  code  and  complying with section 27-117 of this article may continue to
  operate, subject to  such  fire  protection  requirements  as  the  fire
  commissioner shall direct.