Search the NYC DOB Building Information System (BIS) online using your building's address or block and lot number. The database shows the current CO, approved use and occupancy, and any open violations. Compare the CO's approved configuration to how you actually use the property. Common discrepancies include finished basements, additional dwelling units, and commercial-to-residential conversions that were never permitted.
From the seller playbook: Certificate of Occupancy Verification and Illegal Conversion Cure Before Sale
This is general information, not legal, tax or accounting advice. Every situation is different. Talk to a licensed attorney, accountant or tax professional before you act.
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