Fill out and sign the Change Application and Online Agreement. • If you are a Sales Agent, your Broker MUST also sign all forms.• Complete and sign the Application Form. Can a realtor sign a sales contract without a complete listing agreement? Select the Perfect Real Estate Company in Contra Costa Centre, California for New Agents. Although licensed to list, sell and lease real estate, Brokers may not have expertise on the issues in this Advisory. The Real Estate Division is the only local public agency in Contra Costa County that is certified for acquisition of property for state highways. The Bay East Association of Realtors (AOR) is a professional San Francisco Bay Area organization. Sell your house or buy a home with the top real estate team in Contra Costa County. At Contra Costa Real Estate in Motion, we network with real estate professionals, working together towards developing the regional real estate industry.