The C.A.R. Residential Purchase Agreement. Contra Costa County Bar Association.Answer to Request to: Enforce, Change, End Contact After Adoption Agreement. ADOPT-325, Judges Order to: Enforce, Change, End Contact After Adoption Agreement. Official Forms for Viewing and Downloading. CCAR provides County Disclaimer and Disclosure Advisories and Addenda to CCAR members for pertinent real estate transactions. This is a tutorial on the California residential purchase agreement.