New York being the trendy city that it is, it can be all a gallery owner can do to stay on the cutting edge of such important matters as what neighborhood your business needs to be in in order to attract your better customers. Of late, the hot gallery location has been the West Chelsea neighborhood, but now, there appears to be a retro movement afoot, with several prominent art dealers moving their galleries back to the old “traditional” art neighborhoods of Midtown and the Upper East Side.