The Chicago Spire, slated to be the Americas' tallest building at 2,000 ft, probably won't set any world records for height. But if built, it may achieve other firsts: Longest elevator run, tallest all-residential structure, most slender profile. All this would bear on one of the most extreme tall-building bases ever built. The Santiago Calatrava-designed tower, whose drill-bit-shaped superstructure is scheduled to begin shooting up the second quarter of next year, would stand on 34 rock-socketed caissons designed to withstand the highest end-bearing pressures in Chicago.
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