What if the building is intentionally built as a Faraday Cage thus preventing an outside signal? This way the signal is passively blocked and they can still provide their wifi inside.
Not that I condone their behavior.
Not that I condone their behavior.
The cage may block avenues for that LAN's access to the Internet, but in the worst case scenario, someone could operate a sneakernet bridge by shuttling large storage devices between the wifi LAN inside the doors and the WAN access point outside them. Latency would be terrible, but you could get the packets through eventually.
(for phone service, people just have to give up and go outside)