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Monument to Privacy: Is This Manhattan Skyscraper a NSA Listening Post?

Many have walked by and wondered what purpose this vast, windowless skyscraper in the heart of Manhattan serves. 33 Thomas Street, also known as the "Long Lines Building" (LLB), is an impenetrable monolithic fortress amid canyons of glass and steel. Ostensibly an AT&T telecoms building, the New York Times have recently reported (based on investigative work by The Intercept) that this "blank face[d] monument to privacy" may in fact be a NSA (National Security Agency) listening post, hidden in plain sight.