^ Because they are now digging down the site for underground parking levels.
The waler beam and sheet piling holds back the soil at that level, but when you remove the soil on the backside you don't need them anymore.
Chicago Spire was planned for four stories of underground parking, but it looks like Related is only going to build two. So the bottom of the core will end up at Level -4 and the lowest basement will be at Level -2.
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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