This form is intended for use with the. This Addendum is intended for use in the City of El Cerrito.Please also review the separate Contra Costa. Seller agrees to sell to Buyer, and Buyer agrees to purchase from Seller, subject to the terms, covenants and conditions set forth herein. Buyer agrees to purchase the Property from Seller, and Seller agrees to sell the. A California purchase agreement contains all the provisions, disclosures, and general information needed to secure a binding contract. Official Forms for Viewing and Downloading.