The brutalist structure located at 33 Thomas Street in Lower Manhattan is made up of 29 floors and three underground levels. Built between 1969 and 1974 by John Carl Warnecke & Associates, it was simply referred to as Project X during the planning phase, the Intercept reports.
The 550-foot high-rise was purportedly designed to house enough food and supplies to sustain a “self-contained city” of 1,500 people for two weeks in case a worst-case Cold War scenario involving atomic weaponry arose.
Aside from accommodating “powerful computers, cables, and switchboards” and handling long-distance phone calls, including international ones, the AT&T telecommunications center doubles as a wiretapping facility that targets calls, faxes, and internet traffic, according to the Intercept.
The Long Lines Building is still shown as being owned by AT&T by New York’s Department of Finance, the Intercept found.