impact of machine gun shots. 1945–1990: West Berlin era After the war, the former Reichssportfeld became the headquarters of the British military occupation forces. The administration settled in the northeastern buildings designed by the March brothers in the 1920s, which the Third Reich had used for official sport organisations such as the Reich Academy of Physical Training and extended by 1936, adding the "Haus des deutschen Sports" (House of German Sports) and other buildings (which belong since 1994 to the Olympiapark Berlin, a central sporting facility of the City of Berlin). Soon, the British forces renovated war-damaged buildings but also converted interiors to their specific needs (one gymnasium was converted into a dining hall, another into a garage). From 1951 to 2005, the Olympischer Platz had a giant antenna transmitting for all the portable radios in Berlin. From then until 1994 and their departure, British forces held an annual celebration of the Queen's Official Birthday in the Maifeld with thousands of spectators from Berlin present. During the 1960s, American military and high school football teams introduced hundreds of thousands of Berliners to American football at the stadium in exhibition games. During those years, Bundesliga football matches were played in the Olympiastadion, with Hertha BSC as local team. In the Maifeld, several competitions of football, rugby and polo were staged too. In the summers, the Waldbühne resumed its classical music concerts, and playing movies. The theatre was also used as an improvised ring for boxing matches. 1990–2004: Reunified Berlin In 1998, Berliners debated the destiny of the Olympiastadion in light of the legacy it represented for Germany. Some wanted to tear the stadium down and build a new one from scratch, while others favoured letting it slowly crumble "like the Colosseum in Rome". Finally, it was decided to renovate the Olympiastadion. FIFA chose it as one of the venues of the 2006 FIFA World Cup. The State of Berlin hired a consortium composed of Walter Bau AG and DYWIDAG that won the €45 million franchise. The consortium took charge of the operation of the facilities together with Hertha BSC and the Government of Berlin after the remodelling. On 3 July 2000, the renovation began with a ceremony presided over by the Chancellor Gerhard Schröder, accompanied by Eberhard Diepgen (Mayor of Berlin), Franz Beckenbauer and Prof. Dr. Ignaz Walter. 2004–present: Multi-purpose arena The re-inauguration celebrations of the new Olympic Stadium were carried