(1) If the lease period is not fixed, then each party to the lease may terminate the lease at the latest on the third working day of a lease year with effect for the end of the next lease year. In case of doubt, the calendar year is deemed to be the lease year. Agreement on a shorter period requires the written form.
(2) In those cases in which the lease may be terminated for cause observing the statutory notice period, termination is only allowed with effect for the end of a lease year; it is to be declared no later than the third working day of the half-year at the end of which the lease is to terminate.