Almost all co-op apartments in NYC have subletting rules which apartment owners, also known as shareholders, must follow. A typical coop building in NYC will allow you to sublet your apartment for one or two years every few years.
Most co-ops charge apartment owners a subletting fee, and it’s also customary for co-ops to require a new owner to live in his or her unit for one to two years before being permitted to sublet.
Sublets are subject to co-op board approval. This means that there’s no guarantee you will be permitted to sublet even if you’re in compliance with the building’s subletting policy.