An important milestone has been reached in the construction of 400 Lake Shore Drive in Chicago. According to Urbanize Chicago, a caisson permit has been issued, and below-grade work is scheduled to kick off early next year.

The blog reports that once that work is done, "above-grade work will start in Q1 2025 and continue through Q2 2027. Landscaping and the final completion of the tower is expected for Q3 2027."

The project had previously set a date for around December 1st for its construction to start. SOM's chairman emeritus David Childs is the designer of the two-tower scheme, which quotes the masonry and terra cotta traditions that are synonymous with the Windy City.

The project will culminate in a total of 1,100 residential units. The first phase of its development calls for the construction of the 3.44-acre DuSable Park and the 72-story Tower One, which stands as a half-sized replacement of the more ambitious 2008 Chicago Spire proposal from Santiago Calatrava.

Its construction will be completed by the end of Q3 in 2027. An extant 76-foot deep hole that was drilled at the site in preparation for the foundation of Calatrava’s building, meanwhile, is still filled with water.