In the mid-19th century, the Südstadt (South City) emerged as a workers' housing area and the first urban expansion south of the original train station on Kriegsstraße. The population rose to 15,000 within 20 years after the building ban was lifted in 1847. Werderplatz, as it is today, provided a central hub with shops in 1900. Until 1950, an above-average number of railway and postal workers lived in the Südstadt. In 1970, parts of the old train station served as a market hall. The regional postal headquarters were located next door. With its services, hotels, and government offices, the Südstadt became a link between the city center and the main train station. A central green space was planned during the post-World War II reconstruction, in which over 54% of the district was destroyed. Subsequently, buildings by Mona and the Parkhotel (now the Queens) were constructed. The new Baden State Theatre was built on the site of the former market hall, and open spaces remained limited to the green space.