Computer Assisted Mass Appraisal: Commercial Property Sale History for Washington, D.C.

Daily-updated sale history for active commercial properties on the District of Columbia's real property tax assessment roll. The data is sourced from the Office of Tax and Revenue's Computer-Assisted Mass Appraisal system and is maintained by the Assessment Division for ad valorem tax valuation. Each daily update represents a snapshot from the CAMA system, with data subject to constant change.

Use Cases

• Modeling commercial property valuations based on sale history data.
• Analyzing real estate market trends in Washington, D.C. using daily-updated transaction records.
• Auditing or improving tax assessment methodologies for commercial real estate.
• Conducting geospatial analysis of commercial property sales patterns.

Strengths

• Data is updated daily, providing a current snapshot of the assessment roll.
• Sourced from the authoritative CAMA system used for official tax valuation.
• Available in multiple formats including CSV, GEOJSON, and an ArcGIS REST API.

Limitations

• Row count and specific column definitions are unknown, limiting suitability assessment.
• Description metadata is limited; actual data quality requires manual inspection after download.
• Data is described as 'always subject to change,' which may affect reproducibility.

Provenance

Source

District of Columbia Office of Tax and Revenue's Computer-Assisted Mass Appraisal system.

Collection Method

Extracted from the CAMA system used by the Assessment Division for tax valuation.

Freshness

Last updated 2026-03-25 08:19:52.823113; updated daily.

Geography

Washington, D.C., District of Columbia.