As a main rule, the rent is based on value of the lease, which is again determined by location, property type, size, fixtures and the condition of the lease.
In some cases, the rent depends on whether or not the lease is part of a larger apartment complex or located in a municipality, where the rent is regulated.
The landlord can raise the rent if it is currently too low, compared to the rental value. He or she can also increase the rent when facing an increase in taxes or when improvements have been made. If the landlord wants to raise the rent, you, as tenant, have to be given notice in advance.