Many people also don't know that Vienna was isolated and divided for nearly 50 years during the cold war. A significant amount of the available housing is due to Vienna having a bad economy for almost a century.
Berlin was divided.
Like Berlin, Vienna had occupation zones, but there was never a wall between them.
Huh? I thought that Vienna's partition period following WWII lasted more like ten years than sixty.
The reason "many people dont know" about that is that it didnt happen.
You just made it up.