(1) To the extent that the lessee approves the rent increase, they will owe the increased rent from the beginning of the third calendar month following receipt of the demand for an increase.
(2) Insofar as the lessee does not consent to the rent increase by the end of the second calendar month following receipt of the demand, the lessor may sue for grant of consent. The action must be brought within three additional months.
(3) If the action is preceded by a demand for increase that does not conform to the requirements of section 558a, then the lessor may correct this in the legal dispute or remedy the defects in the demand for increase. In this case as well, the lessee is entitled to the period of time allowed for consent under subsection (2) sentence 1.
(4) A deviating agreement to the disadvantage of the lessee is ineffective.