in Potsdamer Strasse, was the Weinhaus Rheingold, built by Bruno Schmitz (1858–1916) and opened on 6 February 1907. Intended to be a concert venue until concerns were raised about increased traffic problems in the already congested streets, it was ruled that it should serve a gastronomic purpose only. Altogether it could accommodate 4,000 guests at a time, 1,100 of these in its main hall alone. Many of the total of 14 banquet and beer halls had a Wagnerian theme – indeed, the very name of the complex was taken from the Wagner opera Das Rheingold, the first of the four parts of the cycle Der Ring des Nibelungen, although this name did hark back to the building's planned former role as a concert venue. Another building by the same architect but which still stands – the "Rosengarten" in Mannheim, has a remarkably similar main facade. Finally, on the corner between Potsdamer Strasse and the Potsdamer Bahnhof, stood Bierhaus Siechen, built by Johann Emil Schaudt (1874–1957), opened in 1910 and relaunched under a new name, Pschorr-Haus. At 8.00 p.m. on 29 October 1923, Germany's first radio broadcast was made from a building (Vox-Haus) close by in Potsdamer Strasse. Standing alongside the Weinhaus Rheingold's Potsdamer Strasse entrance, this five-storey steel-framed edifice had been erected as an office building in 1907-8 by architect and one-time Berlin inspector of buildings Otto Stahn (1859–1930), who was also responsible for the city's Oberbaumbrücke over the River Spree. In 1920 the Vox-group had taken over the building and the following year commissioned its remodelling by Swiss architect Rudolf Otto Salvisberg (1882–1940), and then erected two transmitting antennae. Despite several upgrades between December 1923 and July 1924, the nearby Hotel Esplanade's formidable bulk prevented the transmitter from functioning effectively and so in December 1924 it was superseded by a better sited new one, but Vox-Haus lived on as the home of Germany's first radio station, Radiostunde Berlin, founded in 1923, renamed Funkstunde in March 1924, but it moved to a new home in 1931 and closed in 1934. In addition, the former Millionaires' Quarter just to the west of Potsdamer Platz had become a much favoured location for other countries to site their embassies. By the early 1930s there were so many diplomats living and working in the area that it came to be redesignated the "Diplomatic Quarter". By 1938, 37 out of 52 embassies and legations in