Section 28-105.4.1. Emergency work

Work that would otherwise require a permit
  may  be performed without a permit to the extent necessary to relieve an
  emergency condition. An application for  a  permit  shall  be  submitted
  within  2 business days after the commencement of the emergency work and
  shall include written description of the  emergency  condition  and  the
  measures  undertaken  to mitigate the hazard. Emergency work may include
  but shall not be limited to:
    1. Erection of sidewalk sheds, fences, or other similar structures  to
  protect the public from an unsafe condition.
    2. Stabilization of unsafe structural conditions.
    3. Repair of gas leaks.
    4.  Repair  or replacement of heating or hot water equipment servicing
  residential occupancies during the heating season as established by  the
  New York city housing maintenance code.
    5.  Replacement  of  parts  required  for  the operation of a combined
  standpipe or sprinkler system.