150 North Riverside Plaza is a highrise building in Chicago, Illinois, completed in 2017 and anchored by William Blair and Co.

[3] The site is built with air rights over tracks that carry Metra and Amtrak trains into Chicago Union Station.

The building is constructed with a smaller base for a height of 8 stories (104 ft), and cantilevers out to the full size of the office floor space.

[9] Variously referred to by popular names like "The Tuning Fork", "The Champagne Flute", or "The Guillotine", the building has become a highlight of architectural boat tours.

Architecture critic Blair Kamin in his positive review calls it "a persuasive blend of the pragmatic and dramatic.