Short answers, pulled from the story.
King Friedrich Wilhelm III signed the decree establishing the University of Berlin on the 16th of August 1809. The institution opened its doors to students in October 1810 within Prince Henry's Palace on Unter den Linden boulevard.
Wilhelm von Humboldt proposed a radical union of teaching and research that became known globally as the Humboldtian model of higher education. The founders included Johann Gottlieb Fichte and Friedrich Daniel Ernst Schleiermacher who helped shape early curriculum.
Nearly one third of all staff were fired during the Nazi era but the core mission remained intact until political suppression took hold. The Law for the Restoration of the Professional Civil Service resulted in two hundred fifty Jewish professors and employees being fired from the university between 1933 and 1934.
The university reopened in 1946 as the University of Berlin but faced immediate repression from the Soviet Military Administration in Germany. NKVD secret police arrested a number of students in March 1947 as a response to protests within the student body and faculty.
The university consists of three different campuses namely Campus Mitte Campus Nord and Campus Adlershof. Its main building is located in the center of Berlin at the boulevard Unter den Linden and serves as the heart of Campus Mitte.