The Stark Tower Complex is a 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 Located at the top of the Main Tower was the Watchtower of the superhero The Sentry, but it has been replaced by Heimdall's observatory.