How New Mexico County Uses C3 AI to Boost Property Appraisal Accuracy by 50%

New Mexico's most populous county is responsible for identifying and valuing more than 280,000 parcels spanning urban commercial developments, rural agricultural land, and tribal areas — representing over $14 billion in taxable property value. Accurate, transparent, and defensible assessments are foundational to public trust and the funding of critical local services. Yet the county's existing appraisal process was struggling to keep pace with the scale and complexity of its mandate.

The core challenge was a fragmented, manual workflow. Appraisers had to aggregate and reconcile data from disparate systems — including a Computer-Assisted Mass Appraisal (CAMA) platform, Geographic Information System (GIS) tools, and property listing databases — while applying valuation methods that differed across property types. Compounding this, New Mexico is a non-disclosure state, meaning property sale prices are not publicly reported. This forced appraisers to rely on third-party data and voluntary owner disclosures of inconsistent quality, making it especially difficult to establish fair market value for complex commercial properties like offices, retail spaces, and warehouses.

To address these challenges, the county selected C3 AI Property Appraisal, a solution built on AI-based Automated Valuation Models (AVMs). In just 16 weeks from project kickoff, the C3 AI team ingested and unified more than eight million rows of data from CAMA, GIS, and listing sources, then deployed the application across three major commercial property types. This created a single, scalable data foundation capable of driving continuous improvements in both valuation accuracy and operational efficiency.

The results were immediate and significant. Model accuracy improved by over 50 percentage points across all in-scope commercial property types, reducing manual review cycles and accelerating the overall appraisal workflow. Appraisal equity improved threefold, bringing the county into stronger compliance with International Association of Assessing Officers (IAAO) benchmarks. Within just six weeks of the initial production launch, the application was expanded to cover all nine commercial property types plus vacant land parcels — a rapid scale-up despite wide variation in property characteristics and data availability.

With AI-driven insights now embedded in its appraisal process, the New Mexico County Assessor's office can deliver fair, consistent, and defensible valuations faster than ever before. The county has established a new standard for data-driven property assessment, demonstrating how government agencies can leverage enterprise AI to fulfill their public stewardship responsibilities more effectively.