Per the California Revenue and Taxation Code (Section 441), every person who owns, claims, possesses, or controls tangible personal property not specifically exempted, shall file a Property Statement upon request of the Assessor. Generally, personal property that is assessable consists of business property used in the conduct of a business (i.e., machinery and equipment, office furniture and equipment, tools, computer equipment, and leasehold improvements), boats, aircraft, and mobile equipment. Since you have received a Request to File Letter, you are required to e-file a Property Statement with the Assessor.