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.In commercial real estate transactions, whether it's a purchase or lease, letters of intent are ubiquitous. They appear absolutely harmless. Tip: If you're coming in very low on an offer, give the brokers a heads up before you submit so your offer has context and is taken seriously. Every once in a while I get letters in the mail with offers to buy my house. Is a mortgage preapproval letter necessary to make an offer on a house? The short answer is no. 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. Coming up with a purchase offer that the seller will want to say yes to is one of the trickier aspects of the home buying process.