History
The location was previously the site of cast-iron buildings, typical of the area, the facades of which were preserved prior to demolition. The building was a core part of the AT&T Long Lines Department, housing solid-state switching equipment which required a high level of security and space. The Long Lines Department became AT&T Communications in 1984, after the Bell System divestiture. The AT&T Long Lines Building is now commonly known by its street address, 33 Thomas St., like many major New York City commercial buildings.
AT&T gradually transitioned switches and other facilities from their former AT&T Long Lines headquarters building at 32 Avenue of the Americas, just a few blocks away, completing the move by 1999. 33 Thomas is still used for telephone switching, but some of the space is also used as highly secure datacenter space.
On September 17, 1991, management failure, power equipment failure, and human error combined to completely disable AT&T's central office switch at 33 Thomas. As a result, over 5 million calls were blocked, and Federal Aviation Administration private lines were also interrupted, disrupting air traffic control to 398 airports serving most of the northeastern United States. Because the building was designed to be self-sufficient, AT&T had a load shedding agreement with the electric utility, Consolidated Edison, where they would voluntarily switch from utility power to on-site generators on request. This was a routine procedure that had been performed successfully in the past, but on this occasion, it went very wrong. After switching power sources, standard procedure was to check all the equipment power supplies, known as DC plants, for problems. But due to scheduled training, the check was not performed, and one plant went on battery backup. The alarms were not detected until it was too late to maintain uninterrupted power.
After the destruction of the World Trade Center in the September 11, 2001 attacks, AT&T Local Services restored lost facilities they acquired from the former Teleport Communications Group based there, to 33 Thomas and 811 10th Avenue.
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