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Manhattan, New York, New York
Tony Stark (Iron Man)
93 stories (1138'), not including the Sentry's Watchtower located on the roof. The top three floors were originally designed as Stark's home, however, they were later turned into a headquarters and home equipped with state of the art technology for all of their day to day activities.
New Avengers #1 (2005)
The Stark Tower Complex was built as a world-class financial and business facility to complement Midtown Manhattan's business district. The building was completed as a gleaming beacon of modern architecture after four years of excavation and construction. It is located in the vicinity of Manhattan's Columbus Circle approximately 10 blocks north of the Baxter Building, headquarters of the superhero team the Fantastic Four.
While initially intending to use the top three floors of the Main Tower as his state-of-the-art bachelor pad, Stark gave them over to the Avengers as their base of operations after their former base, Avengers Mansion, was destroyed. Longtime caretaker of the Avengers Mansion Edwin Jarvis was asked to resume his duties in the new location. Later, when The Sentry became a member of the Avengers, his long-hidden Watchtower appeared, integrating itself atop the Main Tower, fully integrated into the building's existing architecture. Serving as both Sentry's headquarters and as the private residences of Robert Reynolds and his wife Lindy, the 20-story watchtower is operated and maintained by CLOC (Centrally Located Organic Computer), a near-sentient computer of Sentry's own design. The lower levels of the Main Tower, along with both the South and North Buildings, are largely occupied with Stark's subsidiaries and non-profit organizations.
After the passing of the Superhuman Registration Act (SRA), Iron Man was tapped to head the task force charged with enforcing the Act. Subsequently, Stark Tower became the base of operations of the task force. The controversy surrounding the SRA broke the Avengers team apart leaving Tony Stark to form a new team, the Mighty Avengers, who continue to occupy the Main Tower's higher levels. When the Tower became the headquarters of the SRA task force, it was assigned by the government a squad of Cape-Killer guards with the call sign Force Unit 9.
During the events of World War Hulk, a violent battle between The Hulk and Iron Man nearly caused the collapse of Stark Tower. The tower was rebuilt by Stark under his S.H.I.E.L.D. organization, making it S.H.I.E.L.D. property.