If there is a decrease in the aggregate true value of taxable real property of any constituent municipality, as determined pursuant to subsection b. of section 53 of P.L. 2015, c. 19(C.5:10A-53), the commission shall, subject to the provision of subsection b. of this section, calculate the amount of decreased aggregate true value, occurring in the comparison year, by reason of the acquisition, through purchase, eminent domain, or gift, during the year preceding the comparison year, of taxable real property by a governmental body or agency to be used for a public purpose, whereby said taxable real property parcels or portions thereof became exempt from local real property taxes. Such decreased aggregate true value shall be calculated in the same manner as aggregate true value is determined pursuant to subsection b. of section 53 of P.L. 2015, c. 19(C.5:10A-53) and shall be based on the assessed value in the year of acquisition, of the parcels or portions thereof affected.
N.J.S. § 5:10A-55