A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price. A California purchase agreement contains all the provisions, disclosures, and general information needed to secure a binding contract.This Addendum is intended for use in the City of Oakland. Please also review the separate. BUYER agrees to purchase and SELLER agrees to sell the real property, and the improvements thereon, commonly known as: , in the County of. Use Fill to complete blank online CITY OF OAKLAND (CA) pdf forms for free. Once completed you can sign your fillable form or send for signing.