Section 28-101.4.4. Alterations that reduce the fire safety or structural safety of existing buildings

Notwithstanding  any  other  provision  of  this  code,  where the alteration of any existing building in accordance
  with a provision of this code would result in a reduction  of  the  fire
  safety or structural safety of such building, relevant provisions of the
  1968  building  code shall apply to such alteration unless there is full
  compliance with those provisions of this code  that  would  mitigate  or
  offset such reduction of fire protection or structural safety.