A legal real estate contract must have the complete property description as stated in the documents at the County Recorder's Office in Illinois. Provisions set forth in the agreement include pricing, financing, closing terms, inspections and surveys, property conditions, and more.An Illinois purchase agreement is a standard contract for selling real estate from one party to another. A For Sale By Owner contract Illinois must include: 1. The Purchase Price, 2. Sellers are required to complete a property disclosure statement in which they respond to questions about the material condition of their home. Our detailed apartment lease agreement Illinois template ensures all the required information is in the document. "Listing Agreements". Use MyTax Illinois to file your Form ST-201 and pay any tax due. They cannot kick anyone out without proper notice just because they are the new owner.