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The structure was located on 9.19 acres (3.72 hectares) of land; the dome had a height of 270.67 ft (82.50 m), a structure length of 745.75 ft (227.30 m), a structure width of 606.96 ft (185.00 m), and a total floor area of 102,149.51 square feet (9,490.00 m2). The dome was the largest cable-supported dome in the world. Its roof was made of teflon-coated fiberglass fabric and had an area of 374,584.08 square feet (34,800.00 m2). From its completion until the December 31, 1999 opening of the 20-acre (8.09-hectare) Millennium Dome in London, it was the largest hooked domed structure of any type in the world.