Chicago, Illinois
General-Contractor
40,000 s.f. retail/transportation center and 510,000 s.f. 17-story office tower. Retail center is 4 stories 400,000 s.f. above grade and transportation center is 4 stories and 340,000 s.f. below grade; top down construction. Perimeter retention system consists of slurry wall and structural secant piles; excavation to 50' deep; and 90' deep caissons. Dense downtown urban site.
