Part of a broader urban regeneration project aimed at reclaiming the city's stature as a major European centre for culture and commerce, this HQ building is to be the tallest building in St Petersburg.
The competition-winning design is for a glass-clad tower with a distinctive twisted profile that tapers to a rounded point — evoking the contour of a gas flame. Inspired by the pentagonal plan of an ancient Scandinavian fort believed to have once occupied the site, the tower consists of a central concrete core ringed by five square interlocking floorplates. The floorplates spin on their axes as they ascend, giving the building its twisted effect. A 'cog mechanism' — whereby the five floorplates interlock — ensures the tower's stability. Steel beams link the core to the external columns to further stiffen the structure.
St Petersburg's building regulations reflect its history as a predominantly low-rise city — there simply are no codes for high-rise structures. International standards were used to deliver the designs. Our geotechnical team — primed by years of working with the London clays — justified an optimised solution in the clay strata beneath the site.