Originally published in the January 13, 2026, issue of AI’s Appraisal Now
Reprinted with permission from AI

A newly introduced bill in the Illinois General Assembly highlights the increasingly important role of professional real estate appraisers in resolving land use conflicts tied to large-scale data center development. Illinois House Bill 4319 (2025, 2026), the Property Owner Protection from Data Center Impacts Act, was introduced on January 7, 2026, by Rep. Jed Davis (R, 75). The legislation establishes a framework allowing property owners to seek compensation for measurable harm caused by the construction or operation of nearby data centers, with valuation determinations grounded in professional appraisal analysis.

HB 4319 makes a property owner eligible for compensation if the property is located within 1,000 feet of a data center and has experienced measurable harm, including:

• Reduction in fair market value
• Loss of business revenue
• Environmental or operational impacts such as noise, vibration, traffic, stormwater burden, or lighting

The bill acknowledges that certain impacts, such as relocation burdens and operational disruptions, may create economic harm beyond traditional valuation measures, while still requiring appraisal-supported evidence for real property compensation.

A Structured, Independent Valuation Framework

Rather than relying on administrative estimates or litigation-driven claims, HB 4319 establishes a structured, appraisal-based valuation process designed to ensure independence, balance, and credibility:

• Both the property owner and the data center developer must obtain appraisals prepared by state-certified or -licensed appraisers.
• If the appraisals differ by more than 10%, a third appraiser is randomly selected by the state to reconcile the valuation using professional judgment.
• All appraisal costs are borne by the data center developer or owner.

This approach positions appraisers as neutral experts who are central to resolving valuation disputes arising from emerging and intensive land uses.

Why This Matters Beyond Illinois

As data center development accelerates nationwide, policymakers are increasingly challenged to balance infrastructure growth with property owner protections. HB 4319 is notable for placing independent appraisal analysis at the center of that balance, offering a framework that other states may look to as similar issues emerge.

The Appraisal Institute’s Government Affairs team will continue tracking the bill and promoting its core concepts, particularly the role of qualified appraisers, in policy discussions across the country.