Section 27-549. General

The provisions of this section shall apply to all
  places of assembly classified in occupancy group F-3 or  F-4  under  the
  provisions  of  subchapter  three  of this chapter. F-3 or F-4 places of
  assembly shall comply with all the requirements of article two  of  this
  subchapter and the following:
    (a) Stage requirements.
    (1)  With  scenery  and  scenic elements. Where an F-3 or F-4 place of
  assembly provides a stage using scenery and scenic elements,  the  space
  shall  comply  with  all  of the requirements of this code applicable to
  F-1a places of assembly.
    (2) Without scenery and scenic elements. Where an F-3 or F-4 place  of
  assembly  provides  a  stage  not  using scenery or scenic elements, the
  space shall comply with all of the requirements of this code  applicable
  to F-1b places of assembly.
    (3)  Cabarets.  In  all  F-4 places of assembly used as a cabaret, the
  stage dressing rooms and property rooms shall be provided with automatic
  sprinkler and fire alarm protection in compliance with the provisions of
  subchapter  seventeen  of  this  chapter.  Existing  premises  shall  be
  required  to conform with this requirement on or before January twelfth,
  nineteen hundred eighty.
    (b) Retroactive provisions. On or  before  January  twelfth,  nineteen
  hundred  eighty,  all places of assembly providing entertainment or used
  as a cabaret within F-3  or  F-4  occupancies  shall  be  provided  with
  automatic  sprinkler  and  fire  alarm  protection  to  comply  with the
  provisions of subchapter seventeen of this chapter.