Section 54. Disposition of maps

The corporation counsel shall cause one of
  the  maps  or plans, so transmitted to him, to be filed in the office of
  the register of the county, or if there be no such register, then in the
  office of the county clerk of the county in which the  property  covered
  by  the map is situated. The map, hereinafter denominated the third map,
  being the second of the two  transmitted  to  the  corporation  counsel,
  shall be disposed of as provided in section sixty-five of this chapter.