2006 New York Code - Alterations To Residence Buildings.

 
    §  27-121  Alterations  to residence buildings. Alterations to one- or
  two-family residence buildings  erected  under  the  provisions  of  the
  building  code  in  effect  prior  to  December  sixth, nineteen hundred
  sixty-eight, and damaged by fire or other catastrophe to the  extent  of
  less  than  fifty  percent  of  the  value  of  the  building (except as
  otherwise provided in section 27-297 of article four of subchapter  four
  of  this chapter) may be reconstructed in accordance with the provisions
  of the building code in effect prior to December sixth, nineteen hundred
  sixty-eight.