Access forms available from the Assessor's office, including benefits, business personal property, change in ownership, and other general forms. Contra Costa County.The guide is divided into eight sections – (I) Overview for. Filing a Business Property Statement, (II) Filing a Form 571-L Electronically (e-File),. Total of 103 forms are available for Contra Costa County for 2024. The applications and forms are available at the front counter of our office. This form enables a business to provide a list of its current assets to the Board of Assessors. Incomplete or inaccurate Annual. Total of 103 forms are available for Contra Costa County for 2024. Transit Authority (Tri Delta Transit) Board of Directors.