71 South Wacker Building vs St. Regis Chicago

Comparing the 71 South Wacker Building and the St. Regis Chicago is interesting because they both rise in Chicago, IL, yet they were conceived by two different design teams, Pei Cobb Freed & Partners and Studio Gang Architects, and were completed at different points in time. They were finished more than a decade apart.

This contrast within the same city allows us to see how different creative minds interpreted the evolving needs of Chicago across time.

Let's take a closer look!

The St. Regis Chicago is clearly the larger tower of the two, both in terms of height and number of floors. It rises to 1194ft (364m) with 101 floors above ground, while the 71 South Wacker Building reaches 679ft (207.1m) with 48 floors above ground.

St. Regis Chicago also offers more total built-up area, a total fo 1,900,001 sqf (176,516m²), which is about 135,001 sqf (12,542m²) more than what the 71 South Wacker Building offers.

Of course, each project may have faced different briefs or regulatory constraints, which we don't really know about and could also explain the outcome.

Both the 71 South Wacker Building and the St. Regis Chicago were designed in line with the aesthetic conventions of the Contemporary style.

At the time, this style was at the height of its popularity. So both Pei Cobb Freed & Partners and Studio Gang Architects followed what was in many ways expected of them, producing designs that fit comfortably within contemporary architectural norms, rather than breaking with convention.

The 71 South Wacker Building is primarily commercial, while the St. Regis Chicago is primarily residential.

The St. Regis Chicago incorporates a 5-star hotel with 192 rooms. More information is available at the official website.

The St. Regis Chicago offers 393 residential units.

Both towers provide significant parking capacity, with 71 South Wacker Building offering 163 spaces and the St. Regis Chicago offering 295.

The two towers rely on different structural systems, reflecting distinct engineering strategies.

The 71 South Wacker Building uses a Framed Tube In Tube structural system, which combines a strong central core with a perimeter tube of columns, while the St. Regis Chicago uses a Frame system, that relies on a regular grid of columns and beams to sustain its weight.

Yet, when it comes to their facade, they both employed the same solution, a Curtain Wall facade.

A curtain wall is a non-load-bearing facade hung from the structural frame. It is anchored to floor slabs and transfers only its own weight and wind loads, allowing for sleek, glassy exteriors.