what is the windowless building in new york

The windowless building in New York is located at 33 Thomas Street in Tribeca, Lower Manhattan. It is a 550-foot-tall (170 m) skyscraper that was originally built for the New York Telephone Company, a subsidiary of AT&T, to house one of the most important telecommunications hubs in the United States. The building is an example of the Brutalist architectural style and has no windows, except for the entrance, and is made from precast concrete panels clad with flame-treated textured Swedish granite faces. The building is designed to withstand major threats and is fortified with a number of distinct features that helped it become a top-secret security hub. The building is still used by AT&T and is owned by the company.