The iconic Burj Khalifa may lose its title as the world's tallest building to Saudi Arabia's Jeddah Tower, which is expected to surpass its height upon completion, according to Guinness World Records (GWR). The Burj Khalifa, built 14 years ago, became the world's tallest building at 828 meters (2,716 feet 6 inch) setting numerous records and becoming a global phenomenon.