N.Y. Real Prop. Law § 236
Notwithstanding any contrary provision contained in any lease hereafter made which affects premises demised for residential use, or partly for residential and partly for professional use, the executor, administrator or legal representative of a deceased tenant under such a lease, may request the landlord thereunder to consent to the assignment of such a lease, or to the subletting of the premises demised thereby. Such request shall be accompanied by the written consent thereto of any co-tenant or guarantor of such lease and a statement of the name, business and home addresses of the proposed assignee or sublessee. Within ten days after the mailing of such request, the landlord may ask the sender thereof for additional information as will enable the landlord to determine if rejection of such request shall be unreasonable. Within thirty days after the mailing of the request for consent, or of the additional information reasonably asked for by the landlord, whichever is later, the landlord shall send a notice to the sender thereof of his election to terminate said lease or to grant or refuse his consent. Landlord's failure to send such a notice shall be deemed to be a consent to the proposed assignment or subletting. If the landlord consents, said lease may be assigned in accordance with the request provided a written agreement by the assignee assuming the performance of the tenant's obligations under the lease is delivered to the landlord in form reasonably satisfactory to the landlord, or the premises may be sublet in accordance with the request, as the case may be, but the estate of the deceased tenant, and any other tenant thereunder, shall nevertheless remain liable for the performance of tenant's obligations under said lease. If the landlord terminates said lease or unreasonably refuses his consent, said lease shall be deemed terminated, and the estate of the deceased tenant and any other tenant thereunder shall be discharged from further liability thereunder as of the last day of the calendar month during which the landlord was required hereunder to exercise his option. If the landlord reasonably refuses his consent, said lease shall continue in full force and effect, subject to the right to make further requests for consent hereunder. Any request, notice or communication required or authorized to be given hereunder shall be sent by registered or certified mail, return receipt requested. This act shall not apply to a proprietary lease, viz.: a lease to, or held by, a tenant entitled thereto by reason of ownership of stock in a corporate owner of premises which operates the same on a cooperative basis. Any waiver of any part of this section shall be void as against public policy.
N.Y. Real Prop. Law § 236