Easily draft LLC or corporation resolutions to sell real estate. Get authorization to sell property with our customizable templates.1030 W. Higgins Road Suite 365. Park Ridge, IL 60068. No, Illinois law does not require home sellers to hire an attorney, regardless of whether a Realtor is involved in the transaction. Engage in the purchase or sale of company properties. Launch a joint venture. A For Sale By Owner contract Illinois must include: 1. The Purchase Price, 2. Illinois requires those selling FSBO to fill out and file many documents and forms.