Scale of Chicago Spire In case any of you were thinking that hole in the ground looked like a big foundation (which is in actuality ONLY the core foundation), check out this composite from the past two weeks of work at the site. They're excavating the tops of the double 12-foot caissons that will be under each leg of the building in order to tie them together into "supercaissons." Look at the size of this thing's overall footprint now ...http://www.thechicagospire.com/
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