More than three decades later, Sears Tower, this year rechristened as Willis Tower ... are working with structural engineer Thornton Tomasetti and MEP engineer Environmental Systems Design.

A plan to wrap the lower three levels of Chicago’s Willis Tower with an addition ... While some upgrades to the tower such as an updated elevator system and the creation of a new 33rd floor ...

In renderings, the revamped tower looks like a big guy cut off at the ankles. Designed by Chicago architects Skidmore, Owings & Merrill, Willis’s design was based on a structural innovation ...

Those who take an elevator ride up to the 103rd floor of Chicago's iconic Willis Tower ... necessary upgrades to the structural, mechanical, electrical and plumbing systems. Aside from the actual ...

"The protective coating on the glass cracked in one section, but the glass itself did not," reads a Willis Tower statement. "This coating does not affect the structural integrity in any way." ...

Here’s some background information about Willis Tower, formerly the Sears Tower ... One of the first major buildings to have a sprinkler system. 1970 - Construction begins.

Khan is best known as the creator of the “tube” structural system, which is used by most tall buildings to this day. He designed the Sears Tower (now called Willis Tower) and John Hancock ...

Most of her impact is invisible as she attempts to reduce one of the largest carbon footprints in Chicago — that of Willis Tower ... Beardsley considered structural engineering but landed ...