FSBO Paperwork Forms. An Illinois purchase agreement is a standard contract for selling real estate from one party to another.The minimum requirement for preparing to list your home FSBO is to complete any state or locally required residential real estate sales disclosures. I'd like to hear comments on how to make my offer more attractive. First, include the property address as well as its legal description (found on the deed). Then go into detail about what is included or excluded from the sale. Edit, sign, and share chicago real estate contract online. No need to install software, just go to DocHub, and sign up instantly and for free.