The Personal Property Unit is responsible for the discovery and assessment of all taxable business property, boats, commercial and private aircraft. How Do I Register My Business?Personal property held for sale or lease in the ordinary course of business on the lien date of January 1. A fictitious business name shall be filed within 40 days of first transacting business. Once registered, it is effective for 5 years. Our business law lawyer in San Bernardino County can help you make sure you choose the right structure to form your business. Question: The San Bernardino County Fair hires about 150 people during fair time. Fill out a new application and mail to the address noted above. Please indicate what is being changed and when the change is effective. Names and home addresses of the owners or officers of the corporation are also required.