German SIG #Germany Max Steinberg - Berlin date of arrival #germany

Wreschner, Jonathan <Jonathan.Wreschner@...>

Max Steinberg, son of Raphael and Ottilie (nee Posner) Steinberg, was born in
Brussow on 05/12/1876 and died in Auschwitz in 1943.
He lived most of his life in Berlin.

from his known address in 1937 (GrolmanStr in Charlottenberg), and the online
Berlin Addressbucher, I have determined that he was in Berlin already in 1920.

How can I find out when he, initially, came to Berlin? Thank you,

Jonathan Wreschner Efrat, Israel <Jonathan.Wreschner@...>