134. By whom option exercisable.

A lease for a term of years may contain an option for the parties1 or one of them to determine the lease at a stated time or times, or on the happening of stated events, before the expiration of the term (a 'break clause')2. Usually such an option is expressly made exercisable by the tenant only; and, if the lease is silent as to the person who is to exercise it, it may be exercised only by the tenant3.

If the lease has been assigned, the option is exercisable by the person in whom the term is for the time