The services core was originally clad with around 14 million one centimetre square grey tessarae which, due to a lack of expansion joints and adhesion failure had begun to fall off.
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The exterior is of glass, aluminium and black enamelled steel.
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The interior was designed by Sir Misha Black, co-founder of the Design Research Unit.
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The tower was heavily influenced by skyscraper architecture in America (particularly the Inland Steel Building in Chicago).
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Completed in 2006, the services tower was clad with 7,244 80 Watt photovoltaic modules.
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The building has Europe's largest commercial solar façade and is one of Britain's largest solar power systems.
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CIS Solar Tower was activated by Prime Minister Tony Blair.