Subleasing in New York involves various legalities and requirements. Tenants must navigate both state and city regulations to ensure compliance.I am the only official tenant of an apartment. How can I have a legally-binding sublet agreement with a new, unofficial roommate? The first step in writing a sublease agreement is to describe the property and identify the address. C. Pursuant to the terms of the Lease, Tenant must obtain the prior written consent of Landlord to any sublease of all or any portion of the Premises. YOU should consult with a local real estate attorney to have your rental agreement reviewed and go over your local laws. A sublease agreement is a legal document allowing existing tenants to rent out their rented space to another party, the subtenant. State the name of the parties and the date of the contract. Identify the full names of each party and what their role is in the contract.