What is the AT&T Long Lines Building known for?

It is a 550-foot-tall windowless skyscraper in Lower Manhattan's Tribeca neighborhood, recognized as one of the best examples of Brutalist architecture in NYC. It originally functioned as a major telephone exchange for long-distance calling.

The building is located at 33 Thomas Street in the Tribeca neighborhood of Lower Manhattan, NYC, standing on the east side of Church Street between Thomas Street and Worth Street.

What is the architectural style of the building?

The building is designed in the Brutalist style by architect John Carl Warnecke. It features a fortress-like appearance with no windows and a facade of precast concrete panels clad with granite.

Construction began in 1969 and was completed in 1974.

Are there any interesting theories or reports about the building?

In 2016, reports from The Intercept claimed the building serves as an NSA mass surveillance hub code-named TITANPOINTE. Additionally, the building was conceived to be self-sufficient and capable of operating for two weeks following a nuclear blast.

What should I check before going?

Use Gyde for context, then check official sources for current hours, tickets, construction, and closures.

AT&T Long Lines Building in New York City

AT&T Long Lines Building

A windowless, 550-foot Brutalist fortress in Tribeca, this enigmatic skyscraper was built to house massive telephone switches and is rumored to serve as a clandestine NSA surveillance hub.

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What to know

Standing at 33 Thomas Street in the Tribeca neighborhood of Lower Manhattan, the AT&T Long Lines Building is a striking example of Brutalist architecture. Designed by architect John Carl Warnecke and completed in 1974, the 29-floor tower rises 550 feet without a single window. Its exterior consists of precast concrete panels clad with a granite facade, giving the structure a fortress-like appearance that contrasts sharply with the surrounding city skyline. The building was specifically engineered as a telecommunications hub to house AT&T's carrier exchanges for long-distance telephone switches, known as 'long lines.' At its peak in 1994, the facility processed an average of 175 million calls per day, making it the largest long-distance phone call processing center. To ensure the continuity of these critical services, the tower was conceived to be completely self-sufficient and capable of operating for two weeks following a nuclear blast. Beyond its utilitarian purpose, the building has become a subject of modern intrigue. In 2016, journalists Ryan Gallagher and Henrik Moltke reported in The Intercept that the facility leads a double-life as a National Security Agency mass surveillance hub. This clandestine operation is allegedly code-named TITANPOINTE, adding a layer of mystery to the windowless concrete monolith that stands between Thomas Street and Worth Street.

Visitor tips

Walk along Church Street to see the full scale of the windowless granite facade.
Visit during the day to appreciate the texture of the precast concrete panels.
Allow time to walk around the perimeter to observe the lack of entrances and windows.

Nearby context

Located in the Tribeca neighborhood of Lower Manhattan, this monolith stands on the east side of Church Street. Its stark, utilitarian design provides a jarring architectural contrast to the surrounding residential and commercial buildings of the district.