735 ILCS 5/9-104.1
2021 Illinois Compiled Statutes|Chapter 735 - CIVIL PROCEDURE|735 ILCS 5/ - Code of Civil Procedure.|Article IX - Eviction

 (from Ch. 110, par. 9-104.1)Sec. 9-104.1. Demand; notice; return; condominium and contract  purchasers.(a) In case there is a contract for the purchase of such lands  or tenements or in case of condominium property, the demand shall give the  purchaser under such contract, or to the condominium unit owner, as the  case may be, at least 30 days to satisfy the terms of the demand before an  action is filed.  In case of a condominium unit, the demand shall set forth  the amount claimed which must be paid within the time prescribed in the  demand and the time period or periods when the amounts were originally due,  unless the demand is for compliance with Section 18(n) of the Condominium  Property Act, in which case the demand shall set forth the nature of the  lease and memorandum of lease or the leasing requirement not satisfied.  The amount claimed shall include regular or special assessments, late  charges or interest for delinquent assessments, and attorneys' fees claimed  for services incurred prior to the demand. Attorneys' fees claimed by  condominium associations in the demand shall be subject to review by the  courts in any eviction proceeding under subsection (b) of Section 9-111  of this Act.  The demand shall be signed by the person claiming such possession, his or  her agent, or attorney.(b) In the case of a condominium unit, the demand is not invalidated by  partial payment of amounts due if the payments do not, at the end of the  notice period, total the amounts demanded in the notice for common  expenses, unpaid fines, interest, late charges, reasonable attorney fees  incurred prior to the initiation of any court action and costs of  collection.  The person claiming possession, or his or her agent or  attorney, may, however, agree in writing to withdraw the demand in exchange  for receiving partial payment.  To prevent invalidation, the notice must  prominently state:"Only FULL PAYMENT of all amounts demanded in this notice will invalidate  the demand, unless the person claiming possession, or his or her agent or  attorney, agrees in writing to withdraw the demand in exchange for  receiving partial payment."(c) The demand set forth in subsection (a) of this Section shall be  served either personally upon such purchaser or condominium unit owner or  by sending the demand thereof by registered or certified mail with return  receipt requested to the last known address of such purchaser or condominium  unit owner or in case no one is in the actual possession of the premises,  then by posting the same on the premises. When such demand is made by an  officer authorized to serve process, his or her return is prima facie  evidence of the facts therein stated and if such demand is made by any  person not an officer, the return may be sworn to by the person serving the  same, and is then prima facie evidence of the facts therein stated.  To be effective service under this Section, a demand sent by certified or  registered mail to the last known address need not be received by the  purchaser or condominium unit owner.  No  other demand shall be required as a prerequisite to filing an action under  paragraph (7) of subsection (a) of Section 9-102 of this Act.  Service of the demand by registered or certified mail shall be deemed  effective upon deposit in the United States mail with proper postage prepaid  and addressed as provided in this subsection.  (Source: P.A. 100-173, eff. 1-1-18.)