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.What Items Are Required to Submit an Offer? 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. REBNY Submit Offer Form PDF Filler and Calculator. Prepare your offer to buy NYC Real Estate for a Condo, Co-op, or Townhouse with ease. In this article we will discuss the specific items you need to prepare in order to submit an offer on a property here in NYC. Presenting offers is part art, part science. The science part is the analysis you and your agent will do to examine recent comparable sales.