Notwithstanding the provisions of Section 1604, if within 90 days of the expiration of the two-year period specified in Section 1604 within which a county board is required to hear evidence and make a final determination on an application for reduction in assessment, a taxpayer or his or her agent objects to an assessment appeals board member pursuant to Section 1624.4 or makes application for a hearing officer’s recommendation to be heard before the county board pursuant to Section 1641.1, the two-year period shall be extended by 90 days.