Relating to an exemption from ad valorem taxation of the amount of the appraised value of real property located in certain counties that arises from the installation or construction on the property of border security infrastructure and related improvements and to the consideration of the price paid by certain governmental entities for a parcel of or easement in real property purchased for the purpose of installing or constructing such infrastructure when appraising other real property.

Expanded eligibility to include land under recorded easements granted to the state or United States, not just property owned by the person claiming the exemption.

Added a new definition for 'qualified border security infrastructure agreement' to clarify that written agreements between property owners and the state or federal government qualify for tax exemptions.

Clarified that exemptions apply to improvements installed under qualified agreements or on land subject to recorded easements, with additional improvements not being border security infrastructure also potentially covered.

Added provisions preventing chief appraisers from considering the price paid by the state or federal government when appraising property purchased for border security infrastructure purposes.

Changed the effective date from September 1, 2025 to January 1, 2026, contingent on voter approval of a related constitutional amendment.