5900 Wilshire Building vs Aon Center

Comparing the 5900 Wilshire Building and the Aon Center is interesting because they both stand in Los Angeles, CA, and were completed within 2 years of each other, but they were designed by different architects.

This offers a unique glimpse at how rival designers approached projects in the same city during the same era.

The Aon Center is clearly the larger tower of the two, both in terms of height and number of floors. It rises to 858ft (261.5m) with 62 floors above ground, while the 5900 Wilshire Building reaches 443ft (135m) with 32 floors above ground.

Aon Center also offers more total built-up area, a total fo 1,249,990 sqf (116,128m²), which is about 784,559 sqf (72,888m²) more than what the 5900 Wilshire 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 5900 Wilshire Building and the Aon Center were designed in line with the aesthetic conventions of the International Style style.

Both buildings were completed when the International Style style was already past its peak. This makes them feel like late echoes of the movement, more reflective of continuity or nostalgia than of cutting-edge design at the time.

Both the 5900 Wilshire Building and the Aon Center 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 5900 Wilshire Building offering 135 spaces and the Aon Center offering 1028.

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

The 5900 Wilshire Building uses a Framed Tube In Tube structural system, which combines a strong central core with a perimeter tube of columns, while the Aon Center 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.