Focus on three things: State your intentions, show that you have the financial means to make the purchase and make a personal appeal to the seller. An Offer to Purchase Real Estate sets out the terms of a proposed real estate deal.Create yours now with our free form. An Illinois residential purchase agreement is a legally binding contract between the buyer and seller of a residential property. Choose from our various home offer letter templates to help you and your buyers stand out from the competition. Illinois Free Letter of Intent ( LOI ) Template. Utilize our Letter of Intent to formally express your desire to buy a product or service. Writing a personalized offer letter may be one way for buyers to help stand out in a competive situation. This template is used when a client's offer has been accepted. It acknowledges the acceptance and outlines the next steps in the process.