Built in 1921 the building originally served as a Crissy Field airplane hangar, which helped launch De Havilland DH-48 biplanes as part of the United States Army 91st Observation Squadron. Later it was used as a motor vehicle paint shop and office and storage space for the Army and is a contributing feature to the park's National Historic Landmark status. The hangar was redesigned by San Francisco architect, Mark Horton, and features 42-foot (13 m) wide by 20-foot (6.1 m) tall bi-folding glass hangar door and a second story catwalk overlooking the trampoline structures. Historic photography of the building and the surrounding Presidio are showcased in a 35-foot (11 m) display wall at the entrance of the building.