How was Germany divided up at the end of ww2 how did this effect Berlin?

Germany had suffered heavy losses during the war, both in lives and industrial power ... At the Potsdam Conference, the victorious Allies ceded roughly 25% of Germany's pre-Anschluss territory to Poland and the Soviet Union.

Divided Germany

Berlin, the capital city situated in Soviet territory, was also divided into four occupied zones. Germany also lost territory east of the Oder and Neisse rivers, which fell under Polish control.