The Stark Tower Complex is a fictional high-rise building complex appearing in American comic books published by Marvel Comics. Located in Midtown Manhattan, New York City, USA, the complex is named after its owner Tony Stark, who is the alter ego of the superhero Iron Man. The structure is composed of a 93-story Main Tower flanked by a 35-story South Building and 55-story North Building. Located at the top of the Main Tower was the Watchtower of the superhero The Sentry, but it has been replaced by Heimdall's observatory. The Main Tower is informally known as Avengers Tower, as it serves as the headquarters of the superhero team, the Avengers, similar to the Avengers Mansion. Currently, the main Stark Tower is located in Broadway, occupying the space where the Condé Nast Building is in the real world. The Stark Tower eventually changed to Avengers Tower has been shown in the films starting with The Avengers set in the Marvel Cinematic Universe