HACCC works with participating property owners in Contra Costa County who rent to about 17,000 participant households. STEP 1: Learn About Your.Rights and Find Help. This comprehensive guide aims to shed light on the key aspects of tenant rights in Contra Costa County, balancing the interests of property owners and tenants. Forms ; ADOPT-230, Adoption Expenses ; ADOPT-310, Contact After Adoption Agreement ; ADOPT-315, Request to: Enforce, Change, End Contact After Adoption Agreement. Comprehensive guide to California landlordtenant law. Learn key rules, rights, and responsibilities for landlords and tenants. Failure to Reimburse for Repairs. For example, a landlord who owns one single-family property and one triplex is a small landlord. This Advisory is not meant to be a complete source of information on all matters which can become issues in real property purchase and sale contracts.