Contra Costa County is an active issuer of tax-exempt multifamily mortgage revenue bonds. CHDC offers a variety of down payment assistance programs, either directly or through our affiliate organizations and partners.In order to provide direction to those responsible for management of surplus funds, the County. The County Clerk-Recorder's Office maintains real property records back to 1849. You may search our online index back to 1986. Funding Cycle: The project is seeking to utilize funds from the Federal Housing Loan Bank's Affordable Housing Program.