Section 7-708. Changes

Such regulations, restrictions and boundaries may
  from time to time be amended. An amendment shall be effected by a simple
  majority vote of the board of trustees, except that an  amendment  shall
  require  the approval of at least two-thirds of the members of the board
  of trustees  in  villages  having  three  members  on  such  board,  and
  three-fourths  of  the members of the board of trustees in all the other
  villages in the event  such  amendment  is  the  subject  of  a  written
  protest, presented to the board and signed by:
    1.  the  owners of twenty percent or more of the area of land included
  in such proposed change; or
    2. the  owners  of  twenty  percent  or  more  of  the  area  of  land
  immediately  adjacent  to  that  land  included in such proposed change,
  extending one hundred feet therefrom; or
    3. the owners of twenty percent or more of the area of  land  directly
  opposite thereto, extending one hundred feet from the street frontage of
  such opposite land.
    The  provisions  of  the  previous section relative to public hearings
  shall apply equally to all proposed amendments.