In a significant architectural endeavor, the American studio Skidmore, Owings & Merrill (SOM) is bringing to life a new skyscraper at 400 Lake Shore in Chicago, a site previously designated for the ambitious but ultimately canceled Chicago Spire. This towering structure, projected to reach 841 feet (256 meters), is scheduled for completion in 2027. Recent photographic evidence from late last year confirms that the building is now nearly half-finished, showcasing substantial progress.
Construction Progress and Innovative Design at 400 Lake Shore
The construction of the 400 Lake Shore skyscraper, designed by SOM, has reached a critical phase. With its glass facade and distinctive terracotta mullions partially installed, the building's rectangular form elegantly aligns with the Chicago River, situated on a unique landmass between the river and a nearby slip. This project marks a significant triumph over a nearly two-decade-long series of construction setbacks that plagued the site. The original plan for a 2,000-foot-tall Chicago Spire, first proposed in 2007 by Spanish architect Santiago Calatrava, was abandoned following the 2008 financial crisis, leaving behind a massive 75-foot-deep excavation known as the “Spire Hole.”
SOM's approach to the new skyscraper involved ingeniously incorporating the existing foundations. Faced with the challenge of adapting a design different in scale and height from the original Spire, SOM opted to work with the legacy infrastructure rather than remove it. They introduced a structural mat slab over the deep foundations, allowing for flexible positioning of new shear walls and primary load-bearing elements. This strategy not only maximized the reuse of previous investments but also necessitated an extensive preparatory phase, including pumping out approximately three million gallons of water that had accumulated in the long-dormant foundations.
The construction process is being accelerated by simultaneous work on both the sublevels and the main tower, a method that SOM initiated in early 2024. The building's core features reinforced concrete, supplemented by two belt-and-outrigger wall systems. Recognizing Chicago's notorious winds, SOM utilized its in-house wind tunnel system to engineer a structure capable of withstanding the amplified wind pressure from Lake Michigan. This commitment to environmental performance is central to the design philosophy, eliminating the need for additional tuned mass dampers and guiding the development of the podium and landscape to mitigate pedestrian-level wind effects. While one tower is well underway, the timeline for a proposed second tower remains uncertain.
SOM has a storied history in shaping Chicago's skyline, including the iconic Willis Tower (formerly Sears Tower). Other architectural firms have also contributed to the city's celebrated Riverfront, such as Studio Gang, whose St. Regis skyscraper boasts a striking blue-hued facade and a tiered design. The photography for the 400 Lake Shore project is credited to Dave Burks for SOM.
The development of the 400 Lake Shore skyscraper by SOM is more than just a construction project; it's a testament to resilience, innovative engineering, and architectural prowess. Overcoming decades of stalled plans and technical hurdles, this endeavor showcases how a deep understanding of urban context and environmental factors can lead to transformative structures. It highlights the importance of adaptability in large-scale urban development and offers valuable lessons in repurposing existing infrastructure. This project not only adds a striking new feature to Chicago's famous skyline but also reinvigorates a site that once symbolized urban ambition's limits, turning it into a beacon of modern architectural achievement and sustainable design. It reminds us that even the most challenging sites can be reimagined and revitalized with vision and ingenuity.