Termination for Convenience and Tenant Improvements

[Dan Braverman]

I own a restaurant building that I leased to an restaurant operator who has been an utter nightmare.  It's a 5 year lease, BUT I included a clause in the lease that allows me to terminate the lease for any or no reason upon 180 days notice.  My question is this:  When I exercise this right, will the tenant be able to sue me for the cost of labor and  improvements he made to improve the restaurant?  The termination clause says nothing about the subject, and he is making outrageous claims about how much money he spent fixing up the restaurant to his standards.  Any thoughts are greatly appreciated!