According to the Washington Times, the sky is no longer the limit of skyscraper development around the work.

A recent article on their web site lists 2000+ feet as the present heights of some buildings under contruction including the Chicago Spire.

From the Washinton Times -- "Foundation work started in June on the tallest U.S. building, which would stand 2,000 feet high over downtown Chicago in 2010, if completed on time. The Chicago Spire would look like a giant corkscrew to shed wind currents that might make the building sway. It would house about 1,200 condominiums."

Sky no longer limit for skyscrapers