I wonder what happened to the building when the internet went down. How do you get into the room to reboot the router?

There’s usually a back door with a physical key. The problem can be getting ahold of one of the people with that key though!

There is probably a break-glass procedure for such cases, like, break the literal window.

A lot of modern glass is hard to break. In many cases this is a safety feature (if you can't break the glass you can't get shoved out the window in a fight...)

Is that why there is a brick next to the procedure manual?

That’s the emergency escape brick.