Rem Koolhaas’ Rotterdam practice, Office for Metropolitan Architecture, has won the top European architectural award for its Dutch embassy in Berlin, completed last year.

The Mies van der Rohe award carries a cash prize of €0,000 (£35,000) and is presented every two years by the European Union and the Mies van der Rohe Foundation of Barcelona. The multinational jury, chaired by London-based architect Zaha Hadid, was impressed by the continuous promenade that expresses Dutch “openness” by meandering thought the eight-storey embassy building.