What a New York Certificate of Occupancy tells a business tenant

A commercial space can look suitable without its paperwork answering the intended-use question. New York City’s Department of Buildings describes a Certificate of Occupancy, or CO, as the document stating a building’s legal use or permitted type of occupancy. Reading it is an early research step, not a substitute for professional review of a proposed tenancy.

The department explains that new buildings require a CO, while changes in use, egress or occupancy can require a current or amended certificate for an existing building. That makes the description of the planned activity important. A prospective tenant should be able to explain what the business will actually do, rather than relying only on a broad label in an advertisement.

To locate records, the department directs users to different systems depending on when the certificate was requested. Older requests are searched through the Buildings Information System; requests from March 2021 onward are searched through DOB NOW. Save the document and identify the relevant floor or space so later conversations refer to the same evidence.

An absent certificate does not automatically settle the issue. The department identifies an exception for buildings built before 1938, unless later alterations changed their use, egress or occupancy. Its guidance points to a Letter of No Objection as a possible way to establish legal use for an exempt building. The property’s history therefore matters.

Use the research to prepare specific questions for the owner and a qualified professional: does the record cover this space, does it describe the intended activity, and are further approvals needed? Do not infer a complete approval package from one document. This guide explains the city’s published record system; it does not determine whether a particular property can lawfully accommodate a particular business.