171 North LaSalle Street/ Chicago, Illinois/ 2026

Completed in 1985, 171 North LaSalle Street (also known as the James R. Thompson Center) stands as one of Helmut Jahn’s most influential works, shaping much of our later projects in Europe and the United States. The building introduced groundbreaking concepts in urban design and public space, redefining Chicago’s architectural landscape. As the building’s original architects, we are proud to be part of the team that is bringing the building’s design into the 21st century while maintaining its iconic form.

In late 2021, Jahn began reimagining this landmark as Google’s future Chicago headquarters. This repositioning will carry forward the original vision of urban connectivity, shared space, and an innovative workplace. Key architectural elements—such as the sweeping curved southeast façade and the iconic rotunda—will be preserved, maintaining the building’s distinct identity. Meanwhile, the existing façade will be replaced with a high-performance, triple-glazed curtain wall, enhancing transparency, daylighting, and energy efficiency while reducing reflectivity. Additionally, the five-story atriums along the southeast perimeter will be converted into sheltered, landscaped terraces, enriching the workplace experience.