2006 New York Code - Official Undertakings.

 
    § 18. Official undertakings.  No person elected or appointed to a city
  office  shall  enter  upon or continue in the discharge of the duties of
  his office until he shall have executed and filed with  the  city  clerk
  the  official  undertaking,  if  any,  required to be given and the same
  shall have been approved as to its form and validity by the  corporation
  counsel and as to the sufficiency of the sureties by the mayor. All such
  undertakings  shall  be  recorded  in  the  office of the city clerk. In
  addition to the city officers required in this chapter, or otherwise  by
  law,  to  give official undertakings, the common council may require any
  other city officer to give an official undertaking in such penal sum and
  with such conditions and sureties as it shall direct and approve. It may
  also, in a proper  case,  require  an  undertaking  of  any  officer  in
  addition   to  that  required  by  law.  The  mayor  shall  examine  the
  sufficiency of the proposed sureties of any officer or person from  whom
  an  official undertaking is required and may require such sureties to be
  examined on oath as to their property  qualifications  and  liabilities.
  The deposition of each surety shall be reduced to writing, subscribed by
  him,  certified by the officer administering the oath and annexed to and
  filed with the undertaking. In case any city officer shall fail to  file
  the required official undertaking, if an elective officer, within thirty
  days  after receipt of his certificate of election, and if an appointive
  officer, within fifteen days after receipt of notice of his appointment,
  the office shall be deemed to be vacant and the vacancy shall be  filled
  in  the  manner  herein  provided  for  the filling of a vacancy therein
  happening otherwise than by expiration of term. The official undertaking
  of a city officer shall not be a lien upon real estate owned by  him  or
  the sureties on such undertaking.