6,115
Unrecorded Deteched Garages
1,650
Non-Existent Buildings
$16.2M
Non-Existent Building Assessed Value (AV)
Overview
Parcel-Sense was developed to address a fundamental gap in mass appraisal: the inability to systematically verify the physical reality of improvements across an entire jurisdiction. Traditional workflows rely heavily on historical records, limited inspections, fragmented municipal data, and reactive corrections.
By leveraging parcel-level remote sensing and spatial analysis, Parcel Sense makes it possible to continuously validate assessment data against actual conditions on the ground at scale using the latest leaf-off aerial imagery.
Key Findings
The Cook County analysis revealed thousands of material discrepancies that would not be captured through standard processes. These findings were not isolated anomalies, but consistent patterns across the dataset.
Notably, over 1,600 properties were actively assessed as improved despite no existing structure, representing over $16 million in assessed value. In parallel, more than 6,000 garages were identified that were not recorded in parcel data.
Implications
These results highlight a structural limitation in current assessment systems: without scalable validation mechanisms, discrepancies accumulate over time. Parcel Sense provides a framework to proactively surface these issues, allowing jurisdictions to correct records, improve equity, and strengthen the integrity of the tax base.
Example Parcel Cases
