735 ILCS 5/12-115
Except as to any sale had by virtue of a judgment of foreclosure entered in accordance with Article XV, no real estate shall be sold by virtue of any judgment, except at public sale, between the hours of 9 in the morning and the setting of the sun of the same day, nor unless the time (specifying the particular hour of day at which the sale shall commence) and the place of holding such sale shall have been previously advertised 3 successive weeks, once in each week, in a newspaper published in the county where the sale is made (if there is any newspaper published in such county), and by placing written or printed notices thereof in at least 3 of the most public places in the county where the real estate is situated, specifying the name of the judgment creditor and judgment debtor in the judgment in all of which notices the real estate to be sold shall be described with reasonable certainty, and if there is more than one newspaper published in such county, the judgment creditor or his or her attorney may designate the newspaper in which such notice shall be published.
735 ILCS 5/12-115