Kleihues invited many international architects from 10 countries – including Gottfried Böhm, Mario Botta, Peter Eisenman, Vittorio Gregotti, John Hejduk, Herman Hertzberger, Hans Hollein, Arata Isozaki, Léon Krier, Rob Krier, Charles Moore, Aldo Rossi and James Stirling – to build in the following areas: the Prager Platz in Wilmersdorf as well as the Tegel, southern Tiergarten and southern Friedrichstadt districts. Consequently, the IBA was called by Time magazine "the most ambitious showcase of world architecture in this generation".