The 344 meter tall and 100 story building was completed in 1969. It includes 48 stories of apartments for a total of 711 apartments. There are 29 stories of offices. On the main levels and below ground, there are shops, a hotel, a swimming pool, an ice rink, and restaurant. Apartments are located at the top of the tower. Some of them are so high that the inhabitants sometimes have to call the doorkeeper to ask what the weather's like down on the ground, as the apartments are sometimes above the clouds.
At the beginning of the project, it was controversial mostly because of the location of this massive tower, near the much smaller and more gentle buildings on Michigan Avenue. After its completion, most of the criticism dwindled, but much like with the Sears Tower, the plaza at the entrance was considered very user- unfriendly, being afflicted by heavy gales and loud traffic noise from Michigan Avenue. It was redesigned in 1995 and now includes a 3,5 meters high fountain to muffle the noise and a recirculation of office and shopping traffic.