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. In order to make an offer in NYC, you'll need two documents.The first is proof that you can actually purchase the apartment. Make your opener as personal as possible. An Offer to Purchase Real Estate sets out the terms of a proposed real estate deal. Create yours now with our free form. Here are house offer letter samples to win a bidding war. 3 examples to use as a reference point. Forms ; How To Commence A Civil Action. Discover an impactful sample letter of an offer to buy property.