When the 118-metre tall CIS Tower was built in 1962, it was the tallest building in the United Kingdom. The tower by, Sir John Bumet, Gordon Tait and Partners with G.S. Hay, is recognised as one of the best 1960s modernist buildings. As home to the Co-operative Group, it was designed to showcase Manchester and the Co-operative movement. It was clad in photovoltaic cells in 2005 and is the tallest listed building in the United Kingdom. Along with New Century House which also opened in 1962, its "design of discipline and consistency which forms part of a group with the Co-operative Insurance Society". Gateway House, a modernist office block designed by Richard Seifert & Partners in 1969 on the approach to Manchester Piccadilly station, is considered to be one of Seifert's most loveable buildings.