805 ILCS 105/107.15
Written notice stating the place, day, and hour of the meeting and, in the case of a special meeting, the purpose or purposes for which the meeting is called, shall be delivered not less than 5 nor more than 60 days before the date of the meeting, or in the case of a removal of one or more directors, a merger, consolidation, dissolution or sale, lease or exchange of assets not less than 20 nor more than 60 days before the date of the meeting, by or at the direction of the president, or the secretary, or the officer or persons calling the meeting, to each member of record entitled to vote at such meeting. A residential cooperative not-for-profit corporation containing 50 or more single family units with individual unit legal descriptions based upon a recorded plat of a subdivision and located in a county with a population between 780,000 and 3,000,000 shall, in addition to the other requirements of this Section, post notice of member's meetings in conspicuous places in the residential cooperative at least 48 hours prior to the meeting of the members.
805 ILCS 105/107.15