(1) If the lessor asserts a right to a rent increase under sections 558 or 559, then, until the end of the second month following receipt of the declaration of the lessor, the lessee may terminate the lease for cause with effect for the end of the second month thereafter. If the lessee gives notice of termination, then the rent increase does not take effect.
(2) A deviating agreement to the disadvantage of the lessee is ineffective.