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Those buildings are usually about 90% empty space. Equipment has shrunk along with other electronics. My office is the only thing on an entire second floor of one of these buildings. I would love a window....

This is old info but new to most people. In the late 1990s I worked in the Houston 5E switch surveillance center for ATT. We knew all about Echelon, CALEA, etc. Contrary to what TV portrays we did wiretapping via software. It is impossible to know you are being wiretapped by the feds. The tap simply copies the feed to your phone to a record or another line. The signal is never diverted or "touched". They are right about the large windowless buildings. Quite a few times i have stayed in one during a hurricane. I think those buildings are nigh indestructible.