70 ILCS 1205/10-7a
When any park district owns and holds such real estate, and desires to sell the same under provisions of Section 10-7 hereof or to transfer real estate subject to subsection (f) of Section 10-7, the board shall, by four-fifths vote, adopt a resolution describing such property and in and by said resolution find and declare that said property is no longer needed or useful for park purposes and that it intends to sell or transfer the same. After said resolution has been adopted the same shall be published not less than 3 times (the first and last publication being not less than 10 days apart) in a newspaper published and of general circulation within the park district, if there be such a paper. If there be no such newspaper, then publication shall be in some newspaper of general circulation in such district, if any, or if none, then such resolution shall be posted in not less than 3 public places in said park district and said resolution shall not become effective until 10 days after said publication or posting.
70 ILCS 1205/10-7a