A tenant can sublet without the landlord's permission, even if the lease says its forbidden. If you would like to sublease your apartment, you must first tell your landlord that you want to do this.Some leases allow subletting without prior consent, while others require it. If unsure, checking the lease helps clarify the subletting process. You are entitled to request permission to sublet from the owner, and the owner may not unreasonably refuse such permission. Most leases prohibit subletting, or only allow it with permission. Generally, a rent controlled tenant who is not occupying an apartment pursuant to an existing lease cannot sublet the apartment without the owner's written. Generally, in NYC, tenants have the right to sublet their apartments with the landlord's permission. However, there are some exceptions. If the landlord unreasonably withholds consent the tenant may sublet in accordance with the request.