data . willkara
dataset · HPD via NYC Open Data

HPD Maintenance Code Violations

Every Housing Maintenance Code violation issued by the Department of Housing Preservation and Development. The substrate beneath every "worst landlord" feature, the join key for every tenant-advocacy tool. Joins to PLUTO via BBL.

data through 2026-11-01 · 11,360,074 violations

violations by hazard class

Violations by class, 2024–present

  1. Class B · Hazardous 1.1M
  2. Class C · Immediately hazardous 799K
  3. Class A · Non-hazardous 643K
  4. Class I · Infestation 137K

Tenant-advocacy tools (Who Owns What, Anti-Eviction Mapping Project) join this dataset to PLUTO and the city's LLC ownership records to pierce the corporate veil — identifying the same beneficial owner behind dozens of LLCs all generating Class C violations.

Stories using this data

article

Who owns this building?

Twelve buildings citywide generated more than 20 Class C — immediately hazardous — housing violations apiece since 2024. The named owner is always an LLC. The beneficial owner is always findable. The corporate-veil-piercing pattern at the heart of NYC tenant advocacy.