NYC property compliance guides

Where each kind of NYC property record lives, how to search it, and how to find a building in systems that do not agree on what to call it.

• How to check violations on a NYC property

  Check HPD, DOB, ECB/OATH, 311, DEP and FDNY records for any New York City building, with the official lookup for each and what every system does not show.

  Last reviewed Oct 6, 2026

• HPD violation lookup: finding housing violations by address

  How to look up HPD violations for a NYC building, how to read the class, status and certification dates, and why HPD Online and Open Data can disagree.

  Last reviewed Oct 6, 2026

• How to check DOB violations by address

  Look up Department of Buildings violations for any NYC address using the BIS property profile, and understand why DOB violations and ECB summonses are listed separately.

  Last reviewed Oct 6, 2026

• BIN and BBL: the two numbers NYC systems actually use

  What a Building Identification Number and a Borough-Block-Lot are, how to find them, and why searching by address alone returns the wrong building on some lots.

  Last reviewed Oct 6, 2026