From the 1860s on the wealthy Bourgeoisie of Berlin discovered Charlottenburg as a residential area, among the first were Gerson von Bleichröder and Ernst Werner von Siemens, who had a villa built in the "Berliner Straße" in 1862. At the same time industrial companies like Siemens & Halske and Schering erected large factories in the north-east, at the border with the Moabit district of Berlin. In 1877 Charlottenburg received town privileges and until World War I saw an enormous increase of population with 100,000 inhabitants as of 1893 and a population of 306,000 in 1920, being the second largest city within the Province of Brandenburg, after Berlin. In the course of industrialization in the 19th century, much of Charlottenburg was incorporated in a network of streets laid out in the Hobrecht-Plan in an area that came to be known architecturally as the Wilhelmine Ring.