An Illinois land contract documents the binding terms of the purchase and sale of vacant land between two parties. This is a legally binding contract.Unless you fully understand this Contract, consult an attorney before signing. 1. Customize the agreement: Fill in the template with specific details of the transaction. A legal real estate contract must have the complete property description as stated in the documents at the County Recorder's Office in Illinois. Edit, sign, and share il land purchase contract blank form online. No need to install software, just go to DocHub, and sign up instantly and for free. Address. City. State. Zip. County. Permanent Index Number(s) of Real Estate: ______-______-______-______. The Real Estate is vacant and unimproved. 1. Enter the names of the Purchaser and Seller.