Earlier quoted context omitted.
That’s the AT&T Long Lines Building. It probably did have an NSA surveillance closet, but it wasn’t built without windows for that reason. The story I was told (by older colleagues when I worked at AT&T Labs) was that it was built during a time when riots and street violence were more common, so the fortress appearance was to ensure the city could maintain long-distance connectivity during urban unrest. I believe the…
Perhaps, but the other version would explain the "nuclear-war-proof" thing. I am sure the employees were told SOME kind of legend, because that building begs questions.
There's some good sites out there that go into detail like http://coldwar-c4i.net/