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

Daily updated sale history for active residential properties on the District of Columbia's real property tax assessment roll. The data is extracted from the Office of Tax and Revenue's Computer-Assisted Mass Appraisal (CAMA) system, used for ad valorem property tax valuation. The Assessment Division within the Real Property Tax Administration maintains and updates the data.

Use Cases

• Model residential property valuations based on sale history data.
• Analyze real estate market trends in Washington D.C. based on property sale records.
• Audit property tax assessment fairness using the Computer-Assisted Mass Appraisal (CAMA) system data.
• Study the relationship between property sales and tax assessments for ad valorem tax purposes.

Strengths

• Data is updated daily, providing a recent snapshot of the property assessment roll.
• Data originates from the authoritative CAMA system used for official tax valuation.
• Available in multiple formats including CSV, GEOJSON, and KML for different analysis needs.

Limitations

• Row count and dataset size are unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• Data is described as a 'snapshot' and is always subject to change.

Provenance

Source

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

Collection Method

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

Freshness

Last updated 2026-03-25 08:19:46.589235; updated daily.

Geography

District of Columbia, Washington D.C.