Offer the price that you truly want to pay. When competing against multiple offers, you may not get another chance to raise your initial offer.Outline the terms of your offer clearly and concisely. Let the seller know if you're offering all cash or need financing. 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. Commercial property owners aren't eligible. My realtor told me she can't facilitate a love letter to a seller, said it's illegal in PA. Am I allowed to leave one in their mailbox on my own? Address the Seller and Introduce Yourself. St. Petersburg or Philadelphia Relocation Guide 2.