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In page Willis Building (Ipswich):

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The centre of the building is constructed from a grid of concrete pillars, 14 m (46 ft) apart, supporting cantilevered concrete slab floors. The exterior is clad in 890 dark smoked glass curtain wall.[1] The use of dark glass, a curtain wall and lack of right angle corners mirrors the art deco Express Building in Manchester - one of Norman Foster's favourite buildings.[2] The central escalator well leads up to a rooftop staff restaurant surrounded by a rooftop garden (360 panorama).