The USA's highest occupied office space is the 98th floor of this Chicago structure
The highest occupied level (a service floor) is 358 meters / 1,175 feet leaving... [DOC] [TLE] World Trade Center - Facts & Summary - HISTORY.com [PAR] Instead of the traditional stacked glass-and-steel box construction of many ... At 
1,360 feet, the World Trade Center towers were the tallest buildings in the ... the 
Bunker, at 7 World Trade Center, a 47-story office building adjoining the towers.