Earlier quoted context omitted.
The German constitution mandates that (property) ownership brings obligations for the public good. Ownership is a construct secured by society, so society as a whole must at least partially benefit. As such, keeping a building empty can be considered theft, too.
> As such, keeping a building empty can be considered theft, too. Your assertion makes zero sense even if we accept your thesis at face value. For example, it's absurd to leap from "society mut at least partially benefit" from private property to assert that private property not being used in compliance to your personal taste to be theft. That's just plain nuts from any angle.
You can consider that position nuts, but given the amount of public support and legal backing for a current initiative in Berlin to enact eminent domain against entities that hold > 3000 flats, “plain nuts from any angle” seems to be slightly exaggerated.