Located at 721 (or 890) Fifth Avenue in New York, this three-story townhouse was originally built in 1932 by industrialist Howard Stark as his Manhattan residence. It was eventually donated by Stark's son, founding Avenger Iron Man (Tony Stark), through the charitable Maria Stark Foundation. The mansion served as the longtime home of Earth's Mightiest Heroes, providing housing, training, and medical facilities for Avengers members as well as storing quinjets and other equipment.
