Cheesegrater's steel bolts break free from building An area below the recently completed Cheesegrater building in the City of London had to be cordoned off on Wednesday night after two steel bolts broke on the 47-storey tower, with parts falling to the ground. The triangular glass-clad tower, designed by Richard Rogers" firm Rogers Stirk Harbour, is officially named the Leadenhall building. It recently set a record for office rents in the City when US-based insurance company FM Global took the 41st floor at £85 per sq ft. This eclipsed the previous record of £80 per sq ft set earlier in the year at Irvine Sellar's Shard on the south bank of the Thames. The incident is embarrassing for the joint developers British Land and Oxford Properties. British Land said no one was injured and the structural integrity of the building at 122 Leadenhall Street, which faces the Lloyd's building, also designed by Rogers, was not affected. A full investigation is being conducted by contractor Laing O'Rourke and structural engineers Arup, and the remaining bolts are also being examined. The area was cordoned off around the base of the building where one part of one of the broken bolts had become dislodged and fallen to the ground at some point in the past few days. The bolts connect the nodes (or intersections) of the 15,000-tonne steel frame of the building but, according to British Land, the design allows for such isolated incidents and they do not affect the structural integrity of the building, British Land stressed. A British Land spokesman said this would have no impact on the move-in date of the new tenants. Office tenants, which include insurance firms Aon and Amlin along with Australian serviced office provider Servcorp, are expected to start moving in towards the end of the year. Up to 6,000 workers will be working in the 225 metre skyscraper.