I'm going through the same situation. I'd love to know what the law is, the only thing I found was that once you give notice to your landlord they must actively pursue a new tenant. If they rent the apartment before your lease is up you are no longer responsible for the remaining months of rent. Also, if they do not actively look for a new tenant you can use that as a case if you end up in court. Lastly, any additional fees such as re-rental fee, re-painting fee, repairs, etc, can not exceed the amount of rent due. So if you are leaving a month early you will only owe the month and nothing additional can be assessed. That's all I know. Good Luck.