New York Second Class Cities Law Section 19 - Holding more than one office.

 19. Holding more than one office. No person shall, at the same time,
  hold  more  than one city office.  Upon the acceptance by a city officer
  of a second office the office first held by him shall  thereupon  become
  vacant.  The  term  "city officer" as used herein, however, shall not be
  deemed to include a commissioner of deeds.

Last modified: February 3, 2019