Having a roommate can help lower the costs of renting, but things do not always turn out as planned. There are times when your roommate might decide to leave before the end of your tenancy. It is important that you know what you need to do if this happens.
If your roommate gives you some kind of notice that they are going to be leaving before the end of the lease, you need to get them to sign an agreement. The agreement should state that the roommate will still pay the remaining rent and utilities based on the lease, find a suitable replacement roommate in the NY Area, pay for any damages they have caused and give up any claim to be a tenant. This agreement will legally protect you from your departing roommate claiming they have any rights to still live in the house.