In order to buy a property offered for sale you must have a Written Statement declaring you owe no tax in Collin County. When you're ready to buy a home, making an offer is important: oral promises are not legally enforceable in real estate sales.Sell Your House Now. Fill out the quick form below or call us at 214-463-2809 to get an offer on your house TODAY! In this video we're going to cover how a purchase contract works. An Offer to Purchase Real Estate sets out the terms of a proposed real estate deal. Create yours now with our free form. Fill out the form and we will get back to you within 24 hours. Get a fair offer if you want to sell your house as-is in Colin County and surrounding areas. We would love to make you a fair offer to buy your property.