THE non-profit, international organization Council on Tall Buildings and Urban Habitat (CTBUH) was formed in 1969 and announces the title of "The Worlds Tallest Building” and sets the standards by which buildings are measured. It maintains a list of the 100 tallest completed buildings in the world.

The council currently ranks BurjKhalifa as the tallest at 828 m (2,717 ft).The CTBUH only recognizes buildings that are complete, however, and some buildings listed within these list articles are not considered complete by the CTBUH. Below is a detailed list of the 10 tallest buildings in the world.  5. Petronas TowersCountry: Kuala Lumpur, MalaysiaHeight: 452 m (1,483 ft)Floors: 88Cost Of Project: $1.6 BillionThe Petronas Towers are skyscrapers and twin towers in Kuala Lumpur, Malaysia. They were the tallest buildings in the world from 1998 to 2004 until surpassed by Taipei 101, but remain the tallest twin buildings in the world. The building is the landmark of Kuala Lumpur with nearby Kuala Lumpur Tower. The height of the towers is measured to the top of their structural components such as spires, but do not include antennas.  4. International Commerce CentreCountry: Hong Kong, ChinaHeight: 484 m (1,588 ft)Floors: 108Cost Of Project: $3.85 Billion(estimate)The International Commerce Centre is a 108 floor, 484 m (1,588 ft) skyscraper completed in 2010 in West Kowloon, Hong Kong. It is currently the world’s fourth tallest building as well as the tallest building in Hong Kong. International Commerce Centre was completed in phases from 2007 to 2010. The tower opened in 2011, with the Ritz-Carlton opening in late March and the observatory in early April.  3. Shanghai World Financial CenterCountry: Shanghai, ChinaHeight: 492 m (1,614 ft)Floors: 101Cost Of Project: $1.2 BillionThe Shanghai World Financial Center  is a supertall skyscraper in Pudong, Shanghai, China, developed by Mori Building. It was designed by Kohn Pedersen Fox. It is a mixed use skyscraper which consists of offices, hotels, conference rooms, observation decks, and shopping malls on the ground floors. Park Hyatt Shanghai is the hotel component containing 174 rooms and suites. Occupying the 79th to the 93rd floors, it is the second highest hotel in the world, surpassing the Grand Hyatt Shanghai on the 53rd to 87th floors of the neighboring Jin Mao Tower.  2. Taipei 101Country: Taipei, TaiwanHeight: 509 m (1,670 ft)Floors: 101Cost Of Project: $1.8 BillionTaipei 101 , formerly known as the Taipei World Financial Center, is a landmark skyscraper located in Xinyi District, Taipei, Taiwan. The building ranked officially as the world’s tallest from 2004 until the opening of the BurjKhalifa in Dubai in 2010. In July 2011, the building was awarded LEED Platinum certification, the highest award in the Leadership in Energy and Environmental Design (LEED) rating system and became the tallest LEED building in the world. Taipei 101 comprises 101 floors above ground and 5 floors underground. The building was architecturally created as a symbol of the evolution of technology and Asian tradition (see Symbolism). The tower is designed to withstand typhoons and earthquakes. 1. BurjKhalifaCountry: Dubai, United Arab EmiratesHeight: 828 m (2,717 ft)Floors: 163Cost Of Project: $1.5 BillionBurjKhalifa known as Burj Dubai prior to its inauguration, is a skyscraper in Dubai, United Arab Emirates, and is currently the tallest structure in the world, at 828 m (2,717 ft). Construction began on 21 September 2004, the building officially opened on 4 January 2010. The total cost for the project was about US$1.5 billion; and for the entire "Downtown Dubai” development, US$20 billion.In March 2009, Mohamed Ali Alabbar, chairman of the project’s developer, Emaar Properties, said office space pricing at BurjKhalifa reached US$4,000 per sqft (over US$43,000 per m²) and the Armani Residences, also in BurjKhalifa, sold for US$3,500 per sqft (over US$37,500 per m²).