Social places I’ve meant that it could be some place for children or less earning matures. Like some social services or psychotherapy related.
I don’t know what that building was, as I could then find it easily. Persons living in Berlin could be able to tell that.
Eventually, each link to any social building would be helpful here.

Building can be a little different from the one I’ve pictured here.
But there was fence and gateway at the middle.