Pursuing a short-term efficiency leads to the long-term risk
So let me get it straight: if these buildings lose internet connectivity for any reason, building management systems (including heating and elevator control) shut down in a way which can not be overridden on-site? In Finland, where overnight temperaturs below -20C are normal in winter? All presumably done to eliminate the need for occational visits by the site caretaker?
I assume the same thing would happen if someone digs a ditch across their upstream provider's uplink, or there is a fire in the local exchange, or any of the gazillion other little inevitable accidents happen.
If I were an unfortunate soul owning a unit in those buildings, I would be desperately trying to find a sucker to unload it onto.