What Do You Need to Make an Offer on a House? Today we are going to talk about how to fill out a trek one to four offer.Here are house offer letter samples to win a bidding war. 3 examples to use as a reference point. Let's walk you through how to review and present a real estate purchase contract as a listing agent. The written offer is legally binding, so in most cases a simple letter won't work. I want to write a letter that is compelling. My realtor says he's not allowed to attach letters to offers because he can lose his license. A real estate offer letter outlines the terms for a real estate purchase.