The development was accompanied by an urban planning of broad streets and sidewalks, parks and spacious residential buildings, especially around the southern Kurfürstendamm area, which enabled large parts of Charlottenburg to preserve their affluent residential character. "The richest town of Prussia" established a "Royal Technical College" in 1879 (which later became the Berlin Institute of Technology), followed by the "Physikalisch-Technische Reichsanstalt" and the College of the Fine Arts. A new town hall with a tall spire was erected on the occasion of its 200-year jubilee in 1905 and an opera house opened in 1912. The history of Charlottenburg as a municipality in its own right ended with the Greater Berlin Act of October 1, 1920, when the town became a part of Berlin. The Province of Brandenburg was administered in Charlottenburg from 1918 until the province's dissolution in 1946 after World War II.