The key documents in a seller financing transaction include: (1) Purchase Agreement; (2) Promissory Note; and (3) Deed of Trust. Most business sales involve some form of Seller financing.Our top rated real estate attorneys specialize in providing comprehensive legal representation in real estate purchase and sale transactions. Prior to closing, Buyer shall cause the Purchase Price to be deposited in escrow. b. Title. The California Department of Real Estate has published this booklet in response to an apparent need for information concerning disclosures.