Which is the highest habitable building in the world?

Sears Tower, USA is the highest habitable building in the world. Willis Tower (formerly named, and still commonly referred to as Sears Tower) is a 108 storey, 1451 feet. At the time of its completion in 1974, it was the tallest building in the world, surpassing the World Trade Center towers in New York, and it held this rank for nearly 25 years.