Read about the legal terms and disclosures you must add to an Illinois real estate purchase agreement. Learn what required information you must include.A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price. Download an Illinois residential purchase agreement template to define buyer and seller obligations, financing, and inspections. ACCEPTANCE DATE: ("Acceptance Date"). SELLER'S INFORMATION: Seller's Signature: Seller's Name (print):. (Seller) agrees to sell the real estate and the property described above, if any, at the price and terms set forth herein, and to convey. Fill Online, Printable, Fillable, Blank ILLINOIS RESIDENTIAL PURCHASE AGREEMENT Form.