Visit one of office locations to complete the Business Property Statement. You will be asked to present valid government-issued photo ID when you arrive.Tax Collection Forms. Can the county assessor prorate assessments or taxes between the buyer and seller of taxable personal property? Obtain forms from either the County Assessor or the Clerk of the Board in the county where the property is located). Address Change Requests. Refer to Supplemental Tax Bills section for additional information. Filing requirements for personal property owners. Get help with your San Diego County property taxes. Contact our Property Tax Services office for assistance.