Query the 'DOB Permit Issuance' dataset (Socrata ID ipu4-2q9a) on data.cityofnewyork.us or data.ny.gov, filtering by Job Type = 'Demolition' and address/BIN/BBL
Be aware this dataset draws from the legacy Buildings Information System (BIS) — for permits filed and issued more recently through DOB NOW, check the separate 'DOB NOW: Build – Approved Permits' dataset instead, since BIS-only queries will miss current DOB NOW filings
Cross-reference both datasets when doing a full permit history lookup for a property, since neither alone is guaranteed complete post-DOB NOW migration
Use the returned permit status field to confirm whether a demolition permit is issued, in-process, or expired before treating it as current authorization
Do not confuse this dataset with DOB's separate elevator-related open data sets — 'DOB Permit Issuance' and elevator inspection/device datasets are distinct Socrata resources with different schemas
Known gotchas
The DOB Permit Issuance dataset (ipu4-2q9a) is fed by the legacy BIS system; NYC has been migrating permit types to DOB NOW, so a query limited to this one dataset can miss the most recent demolition permits — check the DOB NOW: Build – Approved Permits dataset as well
This is a distinct dataset/schema from NYC DOB's elevator-related open data — do not reuse elevator dataset field names or assumptions when working with demolition permit records
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