If you are doing a double close, you can't use an assignment contract. So, you'll need a purchase and sale agreement (such as the 2-T).Beer and Wine Wholesalers Templates. Documents. Contact Information. Real Estate Wholesale Contract PDF ✓ easily fill out and sign forms in a minutes with PDFLiner ✓ download blank or edit templates online. The zero down seller finance deals are coming from the third thing in the third way that sellers sell their house which is direct to an investor. It's important to include assignment clauses in the purchase and sale agreement that clearly outline the process and conditions for assigning the contract.