The capping piece to the pinnacle of the Swiss Re headquarters in the City of London was dropped into position last week. It is made up of a steel trellis enclosing a 2.5 m diameter, double-glazed, double-curved skylight. The entire two-storey nose cone to the cigar-shaped office tower was prefabricated and fitted into place by Austrian steelwork specialist Waagner Biro, whose welders had to work upside down at the top of the building. The tower is designed by Foster and Partners and structural engineer Arup and is being built by Skanska Construction.