The Lever House is an office building in New York, USA. The building, originally built in 1961, underwent a facade retrofit in 2008. The retrofit involved mainly a replacement of the steel sub-frame for concealed aluminum glazing channels, which was identical to the original in appearance. All rusted mullions and caps were replaced with new and identical stainless steel mullions and caps. All glass was removed for new panes that are nearly identical to the original and were code compliant.