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.Yes it is appropriate, especially if the seller has an attachment to it. Tell them how smitten you are with it. 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. Want to Stand Out From The Competition? Writing a letter to a home seller can help when making an offer on a home. Consider the pros and cons of writing a house offer letter in real estate transactions. Learn when to write a letter and when to avoid one. There are potential risks involved in this common tactic, including fair housing violations.