His tweet sent social media into a frenzy of speculation, with people calling it everything from the Men in Black headquarters to the National Covfefe Center.
"I heard all kinds of secret stuff that happens inside there," according to another Twitter user willing to chime in.
Still another said, "If I was an evil genius I'd definitely have my headquarters there."
The windowless brick building only has massive air vents on its top floors and midsection.
See photos of Tom Hanks:
Tom Hanks through the years
Tom Hanks through the years
WEST HOLLYWOOD, CA - 1986: Two-time Academy Award-winning actor Tom Hanks poses during a 1986 West Hollywood, California studio photo session to promote his newest movie 'The Money Pit.' Hanks went on to become one of America's favorite actors, starring in such hits as 'Big,' 'Saving Private Ryan,' and 'Forest Gump.' (Photo by George Rose/Getty Images)
SPLASH (1984) TOM HANKS, JOHN CANDY SPL 004
YOU'VE GOT MAIL (1998) MEG RYAN, TOM HANKS YGML 093
THE GREEN MILE 1999 Castle Rock film with Tom Hanks
NEW YORK - NOVEMBER 9: (US TABLOIDS OUT) Actor Tom Hanks appears on MTV's Total Request Live at the MTV Times Square Studios November 9, 2004 in New York City. (Photo by Evan Agostini/Getty Images)
BURBANK, CA - JUNE 11: Actor Tom Hanks (L) appears on 'The Tonight Show with Jay Leno' at the NBC Studios on June 11, 2004 in Burbank, California. (Photo by Kevin Winter/Getty Images)
CANNES, FRANCE - MAY 17: Actors Rita Wilson and Tom Hanks, attend 'The Da Vinci Code' World Premiere & Opening Gala at the Palais during the 59th International Cannes Film Festival May 17, 2006 in Cannes, France. (Photo by Gareth Cattermole/Getty Images)
BEVERLY HILLS, CA - JANUARY 11: Actress-Producer Rita Wilson and Actor-Producer Tom Hanks arrive at the 66th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 11, 2009 in Beverly Hills, California. (Photo by Frazer Harrison/Getty Images)
LOS ANGELES, CA - NOVEMBER 14: Actor Tom Hanks arrives at the Academy of Motion Picture Arts and Sciences' Inaugural Governors Awards held at the Grand Ballroom at Hollywood & Highland Center on November 14, 2009 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)
LARRY CROWNE 2011 Universal Pictures film with Tom Hanks and Gugu Mbatha-Raw
HOLLYWOOD, CA - FEBRUARY 13: Actors Tom Hanks and Julia Roberts pose at the 25th Annual American Society Of Cinematographers (ASC) Awards on February 13, 2011 in Hollywood, California. (Photo by Valerie Macon/Getty Images)
US director and actor Tom Hanks poses during a photocall ahead of the premiere of his latest movie 'Larry Crowne' in Berlin on June 9, 2011. The comedy romace, starring Tom Hanks and Julia Roberts, will be released in German cinemas on June 30, 2011. AFP PHOTO / JOHN MACDOUGALL (Photo credit should read JOHN MACDOUGALL/AFP/Getty Images)
Los Angeles, USA. 24th October 2012. Tom Hanks arriving at the film premiere of "Cloud Atlas" in Los Angeles on October 24th 2012
NEW YORK, NY - OCTOBER 23: Tom Hanks performs a spoken word skit during a taping of 'Late Night With Jimmy Fallon' at Rockefeller Center on October 23, 2012 in New York City. (Photo by Theo Wargo/Getty Images)
HOLLYWOOD, CA - FEBRUARY 26: Actor Tom Hanks poses in the press room at the 84th Annual Academy Awards held at the Hollywood & Highland Center on February 26, 2012 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
NEW YORK, NY - OCTOBER 23: Tom Hanks and Jimmy Fallon play Bruce Springsteen's 'Wrecking Ball' during a taping of 'Late Night With Jimmy Fallon' at Rockefeller Center on October 23, 2012 in New York City. (Photo by Theo Wargo/Getty Images)
HOLLYWOOD, CA - NOVEMBER 16: Actor Tom Hanks presents Honoree Steve Martin with honorary award onstage during the Academy of Motion Picture Arts and Sciences' Governors Awards at The Ray Dolby Ballroom at Hollywood & Highland Center on November 16, 2013 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
CENTURY CITY, CA - JANUARY 25: Actor Tom Hanks speaks onstage at the 66th Annual Directors Guild Of America Awards held at the Hyatt Regency Century Plaza on January 25, 2014 in Century City, California. (Photo by Alberto E. Rodriguez/Getty Images for DGA)
LOS ANGELES, CA - JANUARY 18: Actors Rita Wilson and Tom Hanks attend the 20th Annual Screen Actors Guild Awards at The Shrine Auditorium on January 18, 2014 in Los Angeles, California. (Photo by Kevork Djansezian/Getty Images)
NEW YORK, NY - FEBRUARY 16: Carly Rae Jepsen and Tom Hanks are seen on February 16, 2015 in New York City. (Photo by NCP/Star Max/GC Images)
US actor Tom Hanks poses during the photocall of the film ''Inferno'' in Florence on May 11, 2015. AFP PHOTO / TIZIANA FABI (Photo credit should read TIZIANA FABI/AFP/Getty Images)
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The building is owned by AT&T and it doesn't have any windows because it may be the only New York City skyscraper designed to withstand a nuclear blast.
The skyscraper is located at 33 Thomas Street in lower Manhattan.
According to a 2016 documentary Project X – Field of Vision, the building houses AT&T's telecommunications infrastructure and also serves as a listening post for the National Security Agency.
"Just look at the building — it has got no windows — it looks like something from a space movie," Henrik Moltke, who co-directed the documentary, told Inside Edition. "The building is very sensitive to the sun and temperature. That is why you have these big vents that you can regulate. Basically, it is like a big air conditioner."
The film is narrated by Mr. Robot star Rami Malek and the building is featured in his hit show.
While the building may look intimidating, it could be the safest place to be in the event of a nuclear attack. There's reportedly enough food, water and generator fuel to sustain 1,500 people for two weeks.
When Inside Edition tried to get more answers, security in the building told us the place is off limits to cameras.
For more information about the building and to read Moltke's work about it, click here.