What neighborhood or street has all the well known boutiques in new york?

Question

I'm writing a story about a girl who likes to shop.

what street has all the boutiques?

Answer 1

There's a lot of them. Broadway, W, Broadway, St Marks, E and W Village.  

Answer 2

There's a lot of boutiques in Soho,  Mercer Street, Prince Street, Spring Street, Broadway.  This is a very trendy area in general.