Section 12-120. Residency requirements

a. Except as otherwise provided in
  section 12-121, any person who enters city service on or after September
  first nineteen hundred eighty-six (i) shall be a resident of the city on
  the date that he or she enters city  service  or  shall  establish  city
  residence  within  ninety days after such date and (ii) shall thereafter
  maintain city  residence  as  a  condition  of  employment.  Failure  to
  establish  or  maintain city residence as required by this section shall
  constitute a forfeiture of employment; provided, however, that prior  to
  dismissal  for  failure  to  establish  or  maintain  city  residence an
  employee shall be given notice of and the  opportunity  to  contest  the
  charge that his or her residence is outside the city.
    b.  Notwithstanding  subdivision a of this section, employees who have
  completed two years of city service shall be deemed to be in  compliance
  with the residency requirements of this section if they are residents of
  Nassau,   Westchester,  Suffolk,  Orange,  Rockland  or  Putnam  county;
  provided, however, that
    (i) the mayor may require deputy mayors, heads of mayoral agencies  as
  defined  in  section 385 of the charter, deputy commissioners, assistant
  commissioners and general counsels of such agencies  to  have  completed
  more  than  two  years  of  city  service  to  be in compliance with the
  residency requirements of this section,
    (ii) the speaker of the council may require  the  council's  chief  of
  staff, deputy chiefs of staff, general counsel and division directors to
  have  completed  more than two years of city service to be in compliance
  with the residency requirements of this section,
    (iii)  the  comptroller  may  require  the  chief  of  staff,   deputy
  comptrollers,   assistant  comptrollers  and  general  counsel  to  have
  completed more than two years of city service to be in  compliance  with
  the residency requirements of this section,
    (iv)  the borough presidents may require their chiefs of staff, deputy
  borough presidents and general counsels to have completed more than  two
  years   of   city  service  to  be  in  compliance  with  the  residency
  requirements of this section, and
    (v) the public  advocate  may  require  the  chief  of  staff,  deputy
  advocates  and  general counsel to have completed more than two years of
  city service to be in compliance with the residency requirements of this
  section.