Hello,
Years ago I was researching relatives who ended up in a DP camp near Munich and at that time Arolsen Tracing Service was closed. I emailed Munich city hall and eventually providing as much information as possible (they also had a child born in Munich after WWII) a Munich city archivist sent me everything they had which was very helpful.

regards,
researching Grosman, Bocian, Garbarski, Kremsdorf, Altman