In Arizona, we have a special form called a Pre-Qualification Form. Try not to go over three to four paragraphs.These are simple, one-page letters explaining who you are and why this home is the perfect fit for you. 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. An offer to purchase will almost always contain supporting documents that the buyer is qualified to purchase. What is in an Offer? An offer letter could include details about why you love the seller's home and why you want to live there. It's often written to tug on their heartstrings. Do you have the correct purchase offer form in front of you?