Official Forms for Viewing and Downloading. Access forms available from the Assessor's office, including benefits, business personal property, change in ownership, and other general forms.Total of 103 forms are available for Contra Costa County for 2024. Forms ; DE-120, Notice of Hearing-Decedents Estate or Trust ; DE-121, Notice of Petition to Administer Estate ; DE-131, Proof of Subscribing Witness. Please Download PDF BOE-571-S REV. The following is a list of some documents that may be recorded if they meet all requirements, and a description or definition of each document. The Public Administrator's office investigates and may administer the estates of individuals who were domiciled in Contra Costa County at the time of death. The applications and forms are available at the front counter of our office. Obtain the form: You can access the PCOR from your local county assessor's office or download it from their website. I went out of business on January 15th, do I still have to complete the BPS and pay personal property taxes?