The Promontory Apartments is a 22-story skyscraper in Hyde Park, Chicago, Illinois, United States designed by Ludwig Mies van der Rohe.

In 1946, real estate developer Herbert Greenwald decided to build a new cooperative housing high-rise in Hyde Park, Chicago, Illinois.

Gropius suggested that Greenwald instead turn to Ludwig Mies van der Rohe, who had offices in Chicago.

On the other two sides, east and west, he recommended floor-to-ceiling windows between I-beam mullions running the height of the building.

[4] The Promontory Apartments were the first Mies building to have an exposed skeleton structure, an architectural theme that would dominate the latter portion of his career.

His Mechanical Engineering Research building on the Illinois Institute of Technology campus featured an exposed concrete frame, but it was infilled with brick spandrel walls and windows and was not constructed in accordance with Mies' design.

The building's success would inspire Greenwald to commission Mies to design more than ten additional apartment projects.

Mies was also encouraged by the reception and abandoned the classic elements such as the traditional floor plan for more experimental steel-and-glass design.

[4] In the mid-1960s, the Promontory Apartments Trust contacted Mies about alterations to the ground floor as well as through-wall air conditioners for the spandrel walls.

The building is designed as a Double T with the horizontal cross-bars joined; the stems of the T's form wings to the rear.