The construction of 400 Lake Shore Drive in Streeterville has recently advanced with a significant concrete pour, involving 250 truckloads delivering nine million pounds of concrete. The 72-story, 858-foot-tall tower is currently the tallest building under construction in the city and will be built on the site of the canceled Chicago Spire project. This first phase of a dual-skyscraper development by Related Midwest will span 1.1 million square feet and house 635 apartments, including 127 affordable housing units. Skidmore, Owings & Merrill’s Chicago office is leading the building’s design, with input from architect David Childs and the interior design by MAWD. The exterior features an interpretation of the iconic “Chicago Window” and incorporates a metal and glass facade with various setbacks, resulting in a distinctive sail-like shape.