Close up of the set of 'Transformers 3' as they film near Randolph.

A crew member creates the "damaged" look by spraying cars on 'Transformers 3' set.

The filming of 'Transformers 3' moves south by the Metra Station at Randolph.

'Transformers 3' continues the destruction outside of McCormick & Schmick's on W. Wacker.

Michigan Ave. destruction from the set of Transformers 3. (Photo by http://twitter.com/judez25)

Actor Josh Duhamel on the set of Transformers

The set of Transformers takes over the street in front of Hotel 71

Fake explosives used in Transformers

Part of the Transformers set

Transformers cast memebers parachute on Wacker

Transformers cast memebers parachute off Trump Tower on Wacker.

Transformers set depicts destruction on Wacker

Part of the Transformers set on Wacker

An upside down truck acts as a set piece in filming of Transformers

Actors depicting military men shoot on Wacker.

Bumblebee unveiled! Scenes from the set of Transformers 3.  (Photo by: http://twitter.com/davidvaldes)

Shia Labeouf and Rosie Huntington-Whiteley on the set of Transformers 3. Michigan Ave. and Wacker Dr. July 16, 2010. (Photo by: http://twitter.com/nickbabs).

Michael Bay directs the crew on the set of Transformers 3. Michigan Ave. and Wacker Dr. July 16, 2010. (Photo by: http://twitter.com/nickbabs).

Scenes from the set of Transformers 3. Michigan Ave. and Wacker Dr. July 16, 2010. (Photo by: http://twitter.com/nickbabs).

Scenes from the set of Transformers 3. Michigan Ave. and Wacker Dr. July 16, 2010. (Photo by: http://twitter.com/nickbabs).

Michael Bay directs Shia Labeouf on the set of Transformers 3. (Photo by: http://twitter.com/davidvaldes)

Scenes from the set of Transformers 3. Michigan Ave. and Wacker Dr. July 16, 2010.

Transformers 3 films in downtown Chicago.

Transformers 3 set on Michigan Ave from adjacent office building.(Photo by: http://twitter.com/mollynch)