I found a number of additional resources for 340 on the Park

This is the development company's web site - beautiful Flash intro and photos including music
http://www.340ontheparkchicago.com/

Emporis listing web site - interesting fact: "340 on the Park is the first residential high-rise in Chicago designed to meet the U.S. Green Building Council's LEED (Leadership in Energy and Environmental Design) certification standards"
http://www.emporis.com/en/wm/bu/?id=102131

The skyscraper page including diagrams
http://skyscraperpage.com/cities/?buildingID=18341

Lakeshore East developer's summary. Note that this building will be the tallest all-residential structure in Chicago and the second tallest in the world.
http://www.lakeshoreeast.com/r_340.html