Must the Owner Report a Tenant, if He/She Rents the Flat?

The owner of the flat has to report the change of the owner or person living in there.
As the owner of the flat, you have to notify the house manager within one month at the latest that you have become the owner of the apartment (including the name and address) and how many people will inhabit it.
It is also necessary to report any change in the number of persons living in the flat, or to announce the name of the tenant if you rent it.