Promontory Apartments vs 330 N. Wabash Avenue Building

Promontory Apartments
330 N. Wabash Avenue Building

Comparing the Promontory Apartments and the 330 N. Wabash Avenue Building is particularly interesting because they share the same skyline in Chicago, IL, and were both designed by Mies van der Rohe. However, they were completed more than 23 years apart.

This offers a unique perspective on how the architect's style and the city's architecture evolved over time.

Height
66.5m
Floors
22

Height & Size

Height
204m
Floors
52

The 330 N. Wabash Avenue Building is clearly the larger tower of the two, both in terms of height and number of floors. It rises to 669ft (204m) with 52 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.

Style
International Style

Architectural Style

Style
International Style

Both the Promontory Apartments and the 330 N. Wabash Avenue Building were designed in line with the aesthetic conventions of the International Style style.

The 330 N. Wabash Avenue Building was designed at a moment when the International Style style was already in decline, making it more of a lingering expression of the movement. In contrast, the Promontory Apartments was built when the style still carried greater cultural weight.

Main use
Residential

Uses

Main use
Commercial

The Promontory Apartments is primarily residential, while the 330 N. Wabash Avenue Building is primarily commercial.

The 330 N. Wabash Avenue Building incorporates a 5-star hotel with 316 rooms.

The Promontory Apartments offers 122 residential units.

Structure
Frame
Facade
Window Wall

Structure & Facade

Structure
Frame
Facade
Curtain Wall

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 Promontory Apartments uses a Window Wall facade, while the 330 N. Wabash Avenue Building uses a Curtain Wall facade.

A Window Wall facade like the one seen in the Promontory Apartments uses panels fitted between floor slabs, leaving slab edges visible, while a curtain-wall facade like the one seen in the 330 N. Wabash Avenue Building uses a lightweight glass curtain wall hung from the structure.

Promontory Apartments 330 N. Wabash Avenue Building
Mies van der Rohe Architect Mies van der Rohe
1946 Design Started 1968
1947 Design Ended 1969
1947 Construction Started 1970
1949 Year Completed 1972
International Style Architectural Style International Style
Residential Current Use Commercial
22 Floors Above Ground 52
66.5 m Height (m) 204 m
Frame Structure Type Frame
Concrete Vertical Structure Material Steel
Concrete Horizontal Structure Material Concrete
No Facade Structural? No
Brick Main Facade Material Glass
Herbert Greenwald Developer IBM Company
Frank Kornacker Structural Engineer C.F.Murphy Associates
IL State IL
Chicago City Chicago
5530–5532 South Shore Dr. Address 330 North Wabash