No 1 Coleman Street, a 20,000m2 commercial development in the City of London, has an exterior appearance that exploits the unique characteristics of the building’s form. The scheme uses polished precast concrete cladding panels configured in a geometric arrangement derived from the curvature of the building’s floor plate but expressed through a series of interlocking and alternating triangulated surfaces. In the design and construction of the façade, the complex geometric structure posed many significant challenges to Decomo, the precast concrete manufacturers, and led to many variations in the cladding details. No coping stones or pier caps were used in this unique building.

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