State Tower is a skyscraper located in Bang Rak business district, Bangkok, Thailand, adjacent to Charoen Krung Road. Built in 2001, it is the largest building in Southeast Asia, with 300,000 m² floor area. State Tower has 68 floors and is 247 meters (811 ft) tall, making it the second tallest building in Thailand and 139th in the world. Conceived by Thai architect Professor Rangsan Torsuwan in the early 1990s and designed by Rangsan Architecture, the massive building is characterised by its thirty-meter tall golden rooftop dome and neo-classical balconies. It was originally named "Silom Precious Tower", later "Royal Charoen Krung Tower" (RCK Tower) and then "State Tower". State Tower contains condominiums, serviced apartments, offices and retail units. It is also home to a five-star hotel called lebua (sic). There is a forty-story high atrium inside, and on the 64th floor is Sirocco , the world's highest open-air restaurant with a panoramic view of Bangkok. State Tower is owned by Challenge Group.