Provides that, if and only if Senate Bill 642 of the 104th General Assembly becomes law in the form in which it passed both houses on October 31, 2025, then a provision in the Property Tax Code concerning the Low-Income Senior Citizens Assessment Freeze Homestead Exemption is amended by (i) specifying that, for taxable years 2029 and thereafter, the term "maximum income limitation" means the maximum income limitation for the immediately preceding taxable year, multiplied by one plus the percentage increase, if any, in the Consumer Price Index-U for the 12-month period ending in September of the calendar year immediately preceding the taxable year for which the limitation is calculated and (ii) adding a definition of the term "Consumer Price Index-u". Effective upon becoming law or on the date Senate Bill 642 of the 104th General Assembly takes effect, whichever is later.