Initially, you do not have to do anything.
The rent agreed in the letting agreement applies. The rent cannot be increased until 01/01/2022, and then by maximum 1.3 %, if the upper rent limits are not exceeded as a result.
If the landlord, despite a friendly reminder of their duties, demands a higher rent in the future, contact your district authority.
Within two months of the commencement of the Act, without prompting, the landlord must notify you of the relevant criteria for calculation of the upper rent limit. If the “frozen” rent of 18/06/2019 is more than 20 % above the allowable upper rent limit, this inflated rent is prohibited nine months after the effective date of the Act.
If the landlord, despite a friendly reminder of their duties, demands a higher rent than the allowable upper rent limit from 23/11/2020, contact the Senate Department for Urban Development and Housing.