I don't mean to be harsh, but if a building that existed at the same time as the war is enough to evoke unpleasant feelings for someone, perhaps Germany is not a great place for that person to be living in general.
Hence why I don't live in Germany. And it's not that the building existed at the time of the war, but that the war is yielding profits in easy real-estate today. What I'm uncomfortable with is war profiteering, done 70 years ex-post-facto.