; or (BB) January 1 of the second year preceding the date on which the determination is made; and (bb) ending on the date on which the reduction in the amount of flood insurance required, as described in clause (i), takes effect; and (II) the amount of premiums that the policyholder would have been required to pay if the reduced amount of flood insurance coverage required, as described in clause (i), had been in effect during the period described in subclause (I) of this clause. (C) Additional relief The Administrator may provide additional refunds in excess of the amounts required under subparagraphs (A) and (B) if the Administrator determines that such additional refunds are warranted. (5) Recovery of costs (A) Appeal expenses If a State or local government, or the owner or lessee of real property, incurs any expense in connection with an appeal under this subsection that is based on a scientific or technical error made by the Administrator and that is successful in whole or part regarding the designation of the base flood elevation or any aspect of a flood insurance rate map, including elevation or designation of a special flood hazard area, the Administrator shall reimburse the State, local government, owner, or lessee in accordance with subparagraph (B). (B) Reimbursable expenses The Administrator— (i) may reimburse a party under subparagraph (A) for reasonable expenses described in that subparagraph— (I) including for a service provided by a surveyor, engineer, or scientific expert; and (II) to the extent measured by the ratio of the successful portion of the appeal as compared to the entire appeal; and (ii) may not reimburse a party under subparagraph (A) for— (I) the cost of legal services