You can get pretty good views from any tall looking building you see in the loop. Heres what you do, walk in to the reception area, you will usually see a tuff looking guy at a desk in the middle of the lobby, he will have a list sign it make up a company name --- these work Velo, standard, ontime (they never really check anyhow)---walk to the elevator press the highest button, ride the elevator to the top and enjoy the spectacular view! Heres some of my favorites I.B.M building 600 n state. The absolute best is 500 N michigan, when you you get up there you can see some surrealistic views of the wrigley building. The predential building has some good views too, but it is a kind of confusing to get around in there.

This method will not work on sears and hancock unfortunately because they have messenger centers.

Good luck