The document discusses several of the world's tallest buildings throughout history, including details about their heights, locations, dates of construction, and architectural firms. Some of the key buildings mentioned are the Sears Tower, which was the world's tallest from 1974 to 1998; the Petronas Twin Towers in Malaysia, which held the title from 1998 to 2004; Taipei 101, which has been the world's tallest since 2004; and Burj Khalifa, the current tallest building in the world located in Dubai.

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3. Sears Tower was the world's tallest building from 1974 to 1975.* Preceded by World Trade Center Surpassed by Petronas Twin Towers Information Location Chicago , Illinois , USA Status: Complete Constructed : 1970-1973 Height Antenna/Spire: 1,730 ft (527m) Roof : 1,450 ft (442 m) Technical details Floor count 108 Floor area 4.56 million sq ft. (3.81 million sq ft. rentable) 418,064 m² (353,961 m² rentable) Elevator count 104, with 16 double-decker elevators Companies Architect: Skidmore, Owings and Merrill

5. Taipei 101 has been the world's tallest building since 2004.*Preceded by Petronas Twin Towers InformationLocation Xinyi District , Taipei , Taiwan StatusComplete Constructed1999-2004 HeightAntenna/Spire509.2 m (1,670.60 ft)Roof449.2 m (1,473.75 ft) Top floor 439.2 m (1,440.94 ft) Technical details Floor count 101 Floor area412,500 m2 (4,440,100 sq ft) Elevator count61, including double-deck shuttles and 2 high speed observatory elevators) Cost NT$ 58 billion ( US$ 1.76 billion) Companies Architect: C.Y. Lee & partners Contractor KTRT Joint Venture, Samsung Engineering & Construction Owner Taipei Financial Center Corp. Management

9. Petronas Twin Towers was the world's tallest building from 1998 to2004. Preceded by : Sears Tower Surpassed by: Taipei 101 Information Location Kuala Lumpur, Malaysia Status Complete Constructed 1992-1998 Height Antenna/Spire 451.9 m (1,482.6 ft) Roof 378.6 m (1,242.1 ft) Top floor: 375.0 m (1,230.3 ft) Technical details: Floor count: 88 Floor area: 395,000 m2 (4,252,000 sq ft) (1 & 2) Elevator count: 78 Companies Architect: Cesar P elli Contractor: Samsung Engineering & Construction Hazama Corporation Management : KLCC

12. CN Tower Toronto 's CN Tower. The CN Tower was the world's tallest free-standing structure on land from 1975 until 2007. Information Location: Toronto , Ontario , Canada Coordinates 43°38′33″N 79°23′14″W43.6426, -9.3871 Coordinates : 43°38′33″N 79°23′14″W43.6426,-79.3871 Status Complete Constructed 1973 – 1976 Use : mixed use Height Antenna/Spire: 553.33 m (1,815.4 ft) Roof: 457.2 m (1,500.0 ft) Top floor: 446.5 m(1,464.9 ft) Technical details Floor count: 147 (equivalent) Elevator Count 6 CompaniesArchitect John Andrews : Architects in association with WZMH Architects

16. Jin Mao Tower from the Oriental Pearl Tower Information Location: 88 Century Boulevard, Pudong District, Shanghai 200121, China Status: Complete Constructed: 1998 Use: Office, Hotel Height Antenna/Spire: 421m1,380ft Roof: 370.0 m / 1,214 ft Top floor: 366.0 m / 1,201 Technical details Floor count: 88 Floor area: 278,707 m² Elevator count: 61 Companies Architect Skidmore, Owings & Merrill

20. The World Trade Center Height: 1,368 and 1,362 feet (417 and 415 meters) Owners: Port Authority of New York and New Jersey Architect: Minoru Yamasaki, Emery Roth and Sons consulting Engineer: John Skilling and Leslie Robertson of Worthington, Skilling, Helle and Jackson Ground Breaking: August 5, 1966 Opened: 1970-73; April 4, 1973 ribbon cutting Destroyed: September 11, 2001

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