Located between the squares Hötorget and Sergels Torg in the central Norrmalm district, they stand 72 m (236 ft) tall and are a clearly visible landmark.
Built 1952-1966, they were labelled the architectonic five "trumpet-blasts" (trumpetstötar) of the renewed city centre by the Municipal commissioner (Borgarråd) Yngve Larsson.
The buildings are designed by different architects (from Hötorget and south: David Helldén, Sven Markelius, Anders Tengbom, Lars-Erik Lallerstedt, and Backström and Reinius) and there is thus a slight variation in the curtain wall façades.
Curtain walls are rare in Sweden and were here directly inspired by the Lever House by Skidmore, Owings and Merrill in New York City built in 1951-52.
Hall then notes there are few city centres in Europe more deeply affected by these Modernist ideas than Stockholm, the most notable exceptions being Rotterdam and Coventry, both largely destroyed during World War II.