Architecturally, the most outstanding store is that in Aoyama, designed by Swiss architects Herzog & De Meuron. This store marked a new concept in what a retail building could be, a concept that Prada itself had started with its first Epicenter in New York’s Soho, designed by Rem Koolhaas and his Office for Metropolitan Design.
http://retaildesignblog.net/2011/07/29/prada-store-by-herzog-de-meuron-tokyo/