During the press event for the new Sydney (Australia) retail store, Sr. VP Retail Ron Johnson said the storefront was the largest such glass façade in the world, and that the store is the second largest in Apple's chain (behind Regent Street in London). Indeed, I measured the store at 112 feet wide, about 45 wider than Regent Street.
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iPods on the second level   kids section on second level
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Genius Bar on third level   the Apple public bathroom
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view into the glass box Apple logo from second level  
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view from balconey on second level view from third level the rear glass staircase
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staircase from ground to second level stacked glass staircases  
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tread of the staircase staircase hardware top of the two glass staircases