The tax imposed by section 12-638l shall be due and payable by the particular grantor who caused such classification to be made in the same manner as the tax imposed by this chapter. The total amount of the tax shall be paid to the town in the same manner as the municipal portion is paid to towns under section 12-638k. Upon the receipt of such payment, such land shall be automatically declassified and the assessor shall forthwith record with the town clerk a certificate setting forth that such land has been declassified. Thereafter, such land shall be assessed at its fair market value as determined by the assessor under the provisions of section 12-63 for all other property, until such time as a record owner may reclassify such land.