Commonly attributed to Ludwig Mies van der Rohe, this building seems actually to have been designed by a less famous architect, Bruno P. Conterato, who worked for Mies’ firm, according to a correction made to this Post-Gazette article. That would explain the startling departure from Mies’ usual style. Almost all of Mies’ most famous buildings are black boxes on stilts, but this one is a white box on stilts. IBM no longer lives here, so the building is now known simply as Four Allegheny Center.
Allegheny Center is a short walk from the North Side subway station.