How To Write A Letter To Home Sellers . Aim for your letter to be about three short paragraphs. At the same time, be humble and ask for the sellers’ blessing on your offer. Berkeley Home Buyer And Seller Testimonial Letters Ira & Carol Serkes from www.home-buy-sell.com Mentioning the local market value as a justification for a slightly lower offer may educate the seller. It is important to include some of all of the above points, but the letter should not be long or wordy. But it shouldn’t be surprising.