Cite Restaurant on the 70th floor of Lake Point Tower offers a beautiful, uncrowded champagne brunch with a marvelous view. Costs around $30 per person. They have a web site:

http://www.cneat.com/cneat-websites/...ront_door.html

And the Signature Room on the 95th floor of the Hancock building mentioned above also has a web site:

http://www.signatureroom.com/