John Hancock Center vs Promontory Apartments

Comparing the John Hancock Center and the Promontory Apartments is interesting because they both rise in Chicago, IL, yet they were conceived by two different design teams, Skidmore, Owings & Merrill and Mies van der Rohe, and were completed at different points in time. They were finished over two decades 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 John Hancock Center is clearly the larger tower of the two, both in terms of height and number of floors. It rises to 1129ft (344m) with 100 floors above ground, while the Promontory Apartments reaches 218ft (66.5m) with 22 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 John Hancock Center and the Promontory Apartments were designed in line with the aesthetic conventions of the International Style style.

At the time, this style was at the height of its popularity. So both Skidmore, Owings & Merrill and Mies van der Rohe followed what was in many ways expected of them, producing designs that fit comfortably within contemporary architectural norms, rather than breaking with convention.

The John Hancock Center is primarily , while the Promontory Apartments is primarily residential.

In terms of capacity, the John Hancock Center offers 703 apartments, while the Promontory Apartments provides 122 units.

The John Hancock Center also provides 710 parking spaces.

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

The John Hancock Center uses a Trussed Tube In Tube structural system, which combines a central core with a perimeter tube reinforced by diagonal bracing, while the Promontory Apartments 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 Window Wall facade.

A window wall system is installed between floor slabs. It is simpler and faster to build than curtain walls, but exposes slab edges and requires careful detailing to avoid thermal bridges.