Although the names of the sixteen designers picked to create a new "Tribune Tower" at the Chicago Architecture Biennial haven't been announced quite yet, according to this article their designs are already being value-engineered in order to be as feasible as possible for potential construction. Whichever design may ultimately go on to the big time of 1:1 scale, the Biennial will be a delightful experience for all of those who still enjoy enormous physical models of both the built and the unbuilt variety: 

In addition to the 16 new versions of Tribune Tower, the curators are commissioning two other 16-foot-tall models of designs for the skyscraper from early in the last century. One is a famous, columnlike version by the Austrian architect Adolf Loos that was part of the 1922 competition. The other, which was not officially entered, is a gridded modernist design by the German architect and urban planner Ludwig Hilberseimer.