The Landmark's second floor was used for offices. The tower's dome included five floors, although floors 26 and 30 were used by employees for maintenance equipment, elevator equipment, and dressing rooms. The shape and strength of the tower's bubble dome was maintained by perlite concrete and steel girders. The Landmark included a high-speed exterior glass elevator, which took people up to the five-story cupola dome. The elevator was located on the tower's west side, facing the Las Vegas Strip. It was capable of moving 1,000 feet per minute, allowing people to go from the ground floor to the 31st floor in 20 seconds. It was the fastest elevator in the Western United States. Hughes biographer Michael Drosnin stated that the elevator was prone to constant malfunctions, and that the Landmark's air-conditioning system "never really worked." The dome provided wraparound views of the city, and was capable of holding over 2,000 people. The dome included lounges and a night club, as well as the high-rise casino on the 29th floor. At the time of the Landmark's opening, the showroom and the Cascade Terrace coffee shop were located on the first floor, while a steak and seafood gourmet restaurant known as Towers Restaurant was located on the 27th floor and a Chinese restaurant known as the Mandarin Room was located on the 29th floor.