In July 2011, British Land and Oxford Properties announced that Laing O'Rourke was the main contractor for the works of the new Leadenhall Building. Throughout 2011, construction began with the basement floors. By December 2012, the steelwork had progressed up to the fifth mega-level, with topping out expected in February or March. The glass cladding had also begun to rise. By June 2013, the steelwork of the building was completely topped out with the glass cladding covering almost half the building.