Section 5-357. Maps; preparation and filing of

a. Whenever, in the opinion
  of the commissioner, it shall be necessary to acquire  any  real  estate
  for  any  of  the  purposes  of  this  subchapter, or for the purpose of
  extinguishing any right, title or  interest  thereto  or  therein,  such
  commissioner,  for and on behalf of the city shall prepare a map or maps
  of the real estate which in his  or  her  opinion  it  is  necessary  to
  acquire  for  such  purposes, and shall submit the same to the mayor for
  approval. The mayor may adopt, modify or reject such maps in whole or in
  part, and may require others to be made instead.
    b. A copy of the map or maps so prepared, with a  certificate  of  the
  adoption  thereof,  signed  by  the commissioner and the mayor, shall be
  filed in  the  office  of  such  commissioner  and  be  open  to  public
  inspection,  and  shall  be  the  map  or  maps of the real estate to be
  acquired, subject to such changes or modifications as  the  commissioner
  may from time to time deem necessary for the more efficient carrying out
  of the provisions of this subchapter.