Indeed, there are a lot of Westfields...
I'd guess he was talking about a store in the South Bay Area of California. Several shopping centers were recently (well, not too recently any more) bought by "Westfield Shopping Town" and renamed such (which is kinda boring, name-wise.) I don't think there is a town by the name of Westfield anywhere nearby, though.
...Nonetheless, I suppose I shouldn't go trying to answer a question aimed at Markio.
...so...
Go Moon!