Rent-to-Own Lease Agreement ā Contract used for a typical rental arrangement with the added course of action to purchase the residence. An Illinois purchase agreement is a standard contract for selling real estate from one party to another.Download a free Illinois LLC Operating Agreement template (Word, Google Doc, PDF). List LLC Members, profit splits, tax info and more. Use our free, customizable Illinois lease agreement template to create a legally binding contract when you lease your Property in the state of Illinois. How to fill out the Illinois Commercial Lease Agreement Template PDF? 1. Enter the names and addresses of both parties. 2. All Illinois Courts must accept these forms.