In general, the maintenance and management of common areas and shared facilities in a tenement building, including door access systems, are typically the responsibility of the building’s owner, property management company or individual flat owners.
In many cases there are several property owners in one tenement and if there is an issue then they are all jointly liable for repair costs.
If you are a tenant or resident in a tenement flat and you are experiencing issues with the door access system, it is advisable to contact your landlord or property management company to report the problem.