Property owners do not own the electromagnetic spectrum in their property. I'd go as far as to say that even the carriers do not own the spectrum. They merely rent it (in the US). I'd say they have certain implicit (and explicit) responsibilities when they assumed the spectrum slices.

Did we really go so far as to welcome intrusion where someone can just ping your phone to get a reply with our location? I for one was very concerned when BART shut down cellular connectivity in order to cover up its incompetence.