Conversation so far:
Who was Ludwig Mies van der Rohe?
He began his architectural career as an apprentice at the studio of Peter Behrens.
When was he born?
March 27, 1886.
Where was he born?
Aachen, Germany.
Did he work?
He worked in his father's stone carving shop and at several local design firms before he moved to Berlin.

Question: What happened in Berlin?
Self-contained rewrite: What happened to Ludwig Mies van der Rohe in Berlin?