Despite the reassuring rivets in the 1,500-pound glass panels, the calm stillness of the air at the Windy City’s pinnacle and the security of a 10,000-pound weight capacity for each of the four 4.3-foot-deep glass boxes that protrude past the sheer edge of the Western Hemisphere’s tallest building — despite all that, you still feel twinges of queasiness. — nytimes.com
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"these glass extensions, which were added to the Skydeck in 2009"
Anyway, most of the Eastern Hemisphere's tallest buildings have a glass-floored observation deck as well. Not sure why this is news.