Telecommunication hubs are always skillfully camouflaged in downtown areas.
Unless you personally know there are acres of electronic equipment inside the building, you never even give it a glance.
Except if you do know what to look for...
This one was a listening hub for the NSA.
https://theintercept.com/2018/06/25/att-internet-nsa-spy-hubs/
911 took out a lot of communications in lower Manhattan. My cousin's business was being billed for months for dead phone lines.