7. In the event that land or buildings or structures in agricultural or horticultural use are converted to non-agricultural or non-horticultural use during the period of an exemption granted pursuant to this section, the structures or buildings upon which the exemption was granted shall be subject to roll-back taxes for the period during which the exemption was operative. Structures and buildings subject to roll-back taxes shall be taxed as provided herein.

1. (a) Notwithstanding any limitations contained in section five hundred fifty of this chapter, the assessors of the appropriate assessing unit shall enter on the taxable portion of the assessment roll of the current year the assessed valuation or valuations of the structures or buildings on which exemption was granted in any prior year or years at the assessed valuation or valuations as set forth on the exempt portion of the assessment roll or rolls.
2. (b) The amount of roll-back taxes shall be computed by the appropriate tax levying body by applying the applicable tax rate for each such prior year to the assessed valuation, as set forth on the exempt portion of the assessment roll, for such structures or buildings for each such prior year during such period of exemption.
3. (c) Such roll-back taxes shall be levied and collected in the same manner and at the same time as other taxes are imposed and levied on such roll.