One PPG Place vs 190 South LaSalle Street

Comparing the One PPG Place and the 190 South LaSalle Street is an interesting exercise, because even though they are located in different cities (Pittsburgh, PA and Chicago, IL), both were designed by Johnson/Burgee Architects and finished within within 3 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.

Both the One PPG Place 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 One PPG Place 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.

Both towers provide significant parking capacity, with One PPG Place offering 700 spaces and the 190 South LaSalle Street offering 55.

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 One PPG Place 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 One PPG Place 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.