Studio Gang's 2020 trio of stepped towers — visually 3 buildings, structurally one.
From Wikipedia
The St. Regis Chicago is a 101-story, 1,198 ft (365 m) multi-use supertall skyscraper within the Lakeshore East development in Chicago, Illinois, United States. Completed in 2020, it is the city's third-tallest building, behind the Willis Tower and Trump Hotel and Tower. Designed by architect Jeanne Gang and her architectural firm, Studio Gang Architects, it is the tallest structure in the world designed by a woman.