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 little tutorial on how to put an offer. Navigate your real estate purchase with confidence. Discover essential steps, from hiring a lawyer to closing, for a smooth transaction. (No, it's not valid as presented, but you don't want a document like that hanging out there). 2. How do you make an offer on a house without a Realtor or an agent? Are you currently working with a real estate agent? Working with a trusted real estate agent can help you ensure you are submitting your best offer, without risking fair housing law violations. A proof of funds letter is upfront proof that you are financially able to purchase the home.