Any action relating to this Contract shall be instituted and prosecuted in the courts of Contra Costa County,. State of California.Want to get started with the easiest way to capture, nurture and close real estate transactions? 3. PAYMENTS: If a Cooperative Supra key is lost, stolen, or replaced, a new Cooperative Agreement must be filled out with the new replacement Supra key. Exhibit B – Not Used. Welcome to the Contra Costa County Superior Court Self-Help Resource Center.