Conversation so far:
Where did Jane Jacobs move?
New York City.
What state is this in?
New York.
Who did she move with?
with her sister Betty.
What year was this?
1935.
What was this during?
during the Great Depression.
What was her fist love?
Jane Butzner took an immediate liking to Manhattan's Greenwich Village.
Why?
which did not conform to the city's grid structure.

Question: What did they do?
Self-contained rewrite: What did the city of Manhattan do?