(1) The rent may be agreed in writing in varying amounts for specific periods of time; in the agreement, each rent amount or each increase is to be indicated as an amount of money (stepped rent).
(2) The rent must remain unchanged in each case for at least one year. During the term agreed for stepped rent, an increase under sections 558 to 559b is excluded.
(3) The right of the lessee to give notice of termination may be excluded for a maximum of four years after the stepped rent agreement is concluded. Termination is permissible at the earliest with effect for the end of this period at.
(4) Sections 556d to 556g are to be applied to any stage of the stepped rent. Instead of the commencement of the lease, that point in time is relevant for the calculation of the amount of the second stage of the stepped rent and all further stages permissible pursuant to section 556d (1) at which the first rent of the respective stage of the stepped rent falls due. The rent amount effectively established in a previous stage of the stepped rent continues in force.
(5) A deviating agreement to the disadvantage of the lessee is ineffective.