Property Assessment Value Changes For New York City

Changes to property assessments and exemptions are recorded by the New York City Department of Finance. The dataset tracks modifications to building and land values over time, using columns like VALCHGBLDG, VALCHGLAND, TAXYR, and PERIOD. It is published by data.cityofnewyork.us and was last updated in February 2026.

Use Cases

• Analyze trends in building value changes (VALCHGBLDG) over specific tax years (TAXYR) to forecast property tax revenue.
• Track the application and impact of specific tax exemption codes (EXCODE) on assessed property values over time.
• Correlate land value changes (VALCHGLAND) with specific change types (CHG_TP) to understand drivers of property reassessment.
• Monitor the sequence and timing of assessment updates using the period (PERIOD) and extract date (EXTRACTDT) fields for audit purposes.

Strengths

• Contains 15 distinct columns detailing assessment changes, exemptions, and administrative metadata.
• Provides separate fields for tracking changes to building value (VALCHGBLDG) and land value (VALCHGLAND).
• Includes temporal fields like TAXYR, PERIOD, and EXTRACTDT for longitudinal analysis.

Limitations

• The total number of records and historical time range covered by the data are unknown.
• Sample data is unavailable, preventing immediate verification of data quality and value distributions.

Provenance

Source

New York City Department of Finance, via data.cityofnewyork.us.

Collection Method

Collected and entered from different sources within the agency.

Freshness

Last updated in February 2026, indicating regular maintenance.

Geography

New York City, New York, USA.