For reference, the Burj peaks at just above 2,700 feet. The tallest tower in the U.S., the Willis Tower in Chicago (formerly the Sears Tower), will be less than half as tall as the Saudis’ appropriately-named Kingdom Tower. Designed by Chicago-based Adrian Smith + Gordon Gill (Sm
ith also designed the Burj), its three-petal shape is inspired by that of local desert flora, a visual metaphor for growth in the desert.That’s romantic and all, but we’re far more blown away by the jaw-dropping 5.38 million square feet of interior space and the main draw: an observation deck on the 157th floor. Total cost: $1.23 billion. Just another drop in the bucket for the oil-rich Saudi government/family, which will plunge a total of $20 billion into the development in Jeddah where the Kingdom Tower will take center stage.