The Hyatt Regency Atlanta is a large business hotel located on Peachtree Street in downtown Atlanta, Georgia. Opened in 1967 as the Regency Hyatt House, John C. Portman, Jr.'s revolutionary 22-story atrium design for the hotel has influenced hotel design enormously in the years since. The hotel instantly became one of the most recognized buildings in Atlanta. The building consists of the main "Atrium Tower" and two extensions, completed in 1971 and 1982, containing a total of 1,260 rooms.