(b) If the real property escaped assessment as a result of an unrecorded change in ownership or change in control for which a change in ownership statement required by Section 480, 480.1, or 480.2, or a preliminary change in ownership report, pursuant to Section 480.3, is not filed, the assessor shall appraise the property as of the date of transfer and enroll the difference in taxable value for each of the subsequent years on the secured roll, with the date of entry specified thereon. However, if prior to the date of the assessment the property has (1) been transferred or conveyed to a bona fide purchaser for value, or (2) become subject to a lien of a bona fide encumbrance for value, the escape assessment pursuant to this paragraph shall not create or impose a lien or charge on that real property, but shall be entered on the unsecured roll in the name of the person who would have been the assessee in the year in which it escaped assessment and shall thereafter be treated and collected like other taxes on that roll. The tax rate applicable shall be the secured rate of the year in which the property escaped assessment. "Assessment year" means the period defined in Section 118. In the event of a failure to file a change in ownership statement required by Section 480, 480.1, or 480.2, or a preliminary change in ownership report, pursuant to Section 480.3, the interest provided in Section 506 may, by the order of the board of supervisors, be added.