The St. Regis Chicago, formerly Vista Tower, is a 101-story, 1,191 ft (362.9 m) supertall skyscraper in Chicago, Illinois. Construction started in August 2016, and was completed in 2020. Upon completion it became the city's third-tallest buildingat 1,198 ft (365 m), surpassing the Aon Center. It is the tallest structure in the world designed by a woman.
Designed by architect Jeanne Gang and her architectural firm, Studio Gang Architects, the St. Regis complements the design of the nearby Aqua skyscraper, also designed by Gang, as the two tallest structures in the world designed by a woman. Initially a joint project between Magellan Development Group and Chinese based Wanda Group, the skyscraper cost nearly $1 billion to construct. Magellan bought the project entirely in 2020, and then partnered with St. Regis Hotels & Resorts, which will open the hotel portion later in 2021.
The structure consists of three interconnected towers, called "stems" with differing heights in a step-like arrangement. The stems are formed from alternating truncated pyramidal shapes called "frustums", giving each tower an undulating appearance, further accentuated by differing shades of glass in alternating pattern. The composition has been likened to sculptor Constantin Brâncuși's Endless Column. According to Studio Gang Architects, the tower "presents itself as three interconnected volumes of differing heights, moving rhythmically in and out of plane" as a result of the curvilinear design. The tower topped out in April 2019. It forms a part of the Lakeshore East development and overlooks the Chicago River near Lake Michigan.