General Information. Access forms available from the Assessor's office, including benefits, business personal property, change in ownership, and other general forms.Select Bill Type, Secured, Supplemental, Redemption, Unsecured. Service Fee Information. Property Tax Forms and Guides. Taxpayers should use these forms and guides to apply for local tax abatements and exemptions and file property returns. Once forms are filed exemption is automatically renewed each year. Writ of Possession of Real Property, Local. Senate Bill 1692 effective September 25, 1996 allowed qualified persons who had prior claims based on age 55 to have a second claim based on disability. If you're considering purchasing property in the area, it's important to learn about Contra Costa County property taxes.