101 California Street Building vs 190 South LaSalle Street

Comparing the 101 California Street Building and the 190 South LaSalle Street is an interesting exercise, because even though they are located in different cities (San Francisco, CA and Chicago, IL), both were designed by Johnson/Burgee Architects and finished within within 5 years of each other. This gives us the chance to see how the same architect's ideas were expressed in different urban contexts almost simultaneously.

The 101 California Street Building is clearly the larger tower of the two, both in terms of height and number of floors. It rises to 600ft (183m) with 48 floors above ground, while the 190 South LaSalle Street reaches 574ft (175m) with 40 floors above ground.

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 101 California Street Building and the 190 South LaSalle Street were designed in line with the aesthetic conventions of the Postmodernism style.

At the time, this style was at the height of its popularity. So Johnson/Burgee Architects followed what was in many ways expected at the time, producing designs that fit comfortably within contemporary architectural norms rather, than breaking with convention.

Both the 101 California Street Building and the 190 South LaSalle Street were designed to serve as commercial towers, and that has remained their main use since their completion, serving similar roles in the urban fabric.

The 190 South LaSalle Street also provides 55 parking spaces.

Both towers share the same structural solution, a Frame system.

A frame structure uses a grid of columns and beams to carry the building's loads. This frees the walls from structural duties, allowing for flexible floor plans and larger windows.

However, when it comes to the facade, both buildings use different approaches. The 101 California Street Building uses a Curtain Wall facade, while the 190 South LaSalle Street uses a Modular facade.

A Curtain Wall facade like the one seen in the 101 California Street Building uses a lightweight glass curtain wall hung from the structure, while a modular facade like the one seen in the 190 South LaSalle Street employs prefabricated panels, often mixing solid surfaces with smaller windows.