Section 99. Alteration of grades and names of streets

The grade of any
  street shall not be fixed or established  except  by  direction  of  the
  common  council.  The  grade of a street heretofore or hereafter legally
  established shall not be changed, except  by  direction  of  the  common
  council,  and  except  also  upon  compensation  for damages done, to be
  ascertained in and by the proceedings provided by law  for  ascertaining
  damages  for  lands taken for the opening of streets. The common council
  shall not alter the name of any street except by ordinance. No ordinance
  altering the name of any street shall be passed by  the  common  council
  until  such ordinance shall have been published at least once in each of
  two successive weeks in the official paper or papers.