Building Address: 233 South Wacker Dr Originally designed in the late 60’s by Architect Bruce Graham and Structural Engineer Fazlur R. Khan of Skidmore, Owings, and Merrill for Chicago-based Sears, Roebuck and Co, Sears Tower was topped out in May of 1973 — over 36 years ago. My Dad, Frantz studied under Fazlur Kahn. I think that Mr. Kahn was…