Look up C of O records to verify legal use and occupancy for any NYC building.
Last updated: March 2026 · 9.4M+ properties indexed
Enter the address into RegWatch or DOB's BIS system.
Final = permanent. Temporary = limited period (check expiration). None = may indicate issues.
Compare the C of O's legal use with the building's actual use. Discrepancies can mean violations.
A pending C of O application may indicate ongoing construction or conversion.
Buildings constructed after 1938 require a C of O. Using a building inconsistently with its C of O can result in DOB violations, fines, and even vacate orders.
You can search some NYC agency databases for free individually (ACRIS, DOB BIS, HPD Online, DOF). RegWatch offers a free account with unlimited property data that searches all 270+ sources at once. Our coverage extends beyond NYC to Nassau, Suffolk, Westchester, and New Jersey counties.
Manually: 30 minutes to several hours per property depending on depth. With RegWatch: under 3 seconds for a complete profile from 270+ sources.
No special tools required. RegWatch works in any modern web browser. For manual research, you just need internet access to city agency websites.
RegWatch data from official NYC sources is updated multiple times per day. Most records are within 24 hours of the agency databases.
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