(b) after all appeals under that Part have been exhausted, the final valuation of the property for the relevant chargeable period is different than it was for purposes of the recalculation under subsection (2), the rating authority shall recalculate the BID contribution levy for that property under section 129N(2) or (3), as the case may be, using the same formula applied in those provisions except where 'B' is now the final valuation of the property referred to in paragraph (b) of this subsection.