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. A little tutorial on how to put an offer.Discover why successful commercial real estate investors use a letter of intent when first making an offer on commercial real estate and how you can too! We offer a customizable sample offer letter to purchase property in PDF. We have a stepbystep guide with some tips from the professionals on how to buy a house without an agent. An Offer to Purchase Real Estate sets out the terms of a proposed real estate deal. Create yours now with our free form. I have purchased multiple properties in PA using an agent, and in my experience the agent always has me review and sign the offer letter before he submits it. Our real estate experts have helped break down the most common areas where real estate purchase offers can go awry and what to read closely before you sign. The buyer purchasing the property and assuming the existing mortgage.