Man who worked in mysterious 29-story windowless skyscraper in New York City describes what it’s like inside

New York City is home to many high-rise buildings—the American city is only third behind Hong Kong and Shenzhen, China, for most skyscrapers—so there are bound to be a few that no one really knows why they’re there.

Especially if it’s got ZERO windows, too – talk about unique architecture.

33 Thomas Street in New York has baffled residents and the internet for a while, leading to many speculating as to what may be going on within its four walls.

Some have even been so brave as to attempt to enter the building to discover for themselves. But to be honest, you’re not going to have a clue unless told by someone that has worked in the building who is willing to spill the beans, and indeed that has happened.

33 Thomas Street has a lot of mystery that surrounds it (Roy Rochlin/Getty Images)

Speaking to the Daily Mail in 2023 under the condition on anonymity, the man says that he was invited, along with his son, in the early 2000s to work as a steamfitter – which involves someone installing wiring and pipes within a building.

According to the son, they were forbidden from entering into certain rooms.

He said: “There were rooms we couldn’t get into. They specifically told us not to enter, and we couldn’t ask what’s inside or why we can’t go in.”

He claimed that him, his father and the rest of the team were ultimately forced to install wires around the room.

He further claimed that crew supposedly came across confidential papers in a cabinet in the basement – and what makes it even more interesting is the documents supposedly detailed what to do in the event of a radiation attack.

If you were to look into it further, you’ll find the official use of the building is as a telephone interchange, and it was formerly known as the AT&T Long Lines Building – so basically just a place to wire up tons of phone lines.