NYC Open Data Explained

What Is NYC Open Data?

NYC Open Data is the city's initiative to make government data freely available to the public. Established by Local Law 11 of 2012, it requires all city agencies to publish their public datasets on the official portal at data.cityofnewyork.us. As of 2026, the portal hosts over 3,000 datasets covering everything from 311 complaints to property tax assessments.

Property-related data comes from agencies including the Department of Buildings (DOB), Housing Preservation and Development (HPD), Department of Finance (DOF), Department of City Planning (DCP), the Fire Department (FDNY), and many others. This data is updated on schedules ranging from daily to annually depending on the agency and dataset.

How RegWatch Uses This Data

RegWatch aggregates, normalizes, and cross-references data from 250+ government sources to create a unified property intelligence profile. Rather than visiting each agency website individually, our platform pulls together violations, permits, tax records, title documents, zoning information, environmental data, and more into a single searchable interface.

Our data pipeline ingests raw datasets, resolves identifiers (BBL, BIN, address), cleans inconsistencies, and indexes records for fast retrieval. We update our databases on regular schedules aligned with agency publication cadences.

Data Sources

Data Accuracy and Limitations

While we strive for accuracy, all data originates from city agency records and is subject to their limitations. Common considerations include:

• Update lag: Some datasets are updated daily, others weekly or monthly. There may be a delay between an event occurring and it appearing in our system.
• Historical gaps: Digital records typically begin in the 1980s-1990s depending on the agency. Earlier records may be incomplete.
• Data entry errors: City records may contain typos, incorrect addresses, or mismatched identifiers.
• Interpretation: Raw violation or permit data may require professional interpretation for specific legal, financial, or construction decisions.

RegWatch provides data for informational purposes. For legal decisions, title clearance, or compliance certification, consult appropriate licensed professionals.

Why This Matters

Before platforms like RegWatch, accessing NYC property records meant visiting multiple agency websites, navigating different search interfaces, and manually cross-referencing records by BBL, BIN, or address. A comprehensive due diligence check that once took hours now takes seconds, while still relying on the same authoritative city data sources that professionals have always used.