Business Lease Agreement

[Account Closed]

Hi, this is my first year leasing and I have a business lease for two years, however, the tenant just informed me that he would have to break the lease one year early. He is paid up-to-date -- my question is; since he is breaking the lease am I required to give him back his deposit and last month's rent or do I apply the last month's rent for his last month December or still charge him for that month's as well? 

(unfortunately, the contract does not state anything about early termination).