I bet it is a variety of factors, all adding up: 1. with all the skyscrapers, there's a very high-density need for secretaries (and their variants), which are

I bet it is a variety of factors, all adding up: 1. with all the skyscrapers, there's a very high-density need for secretaries (and their variants), which are roles that are disproportionately historically filled by women (for whatever reason -- please nobody launch into PC gender flame fest here) 2. lots of rich and/or high "status" ambitious men in suits -- draws many kinds of women like flies (not all, but many) 3. maybe also the high-density concentration of art, dance, advertising, book publishing industries -- all of which seem to disproportionately attract women rather than men ... plus many other factors. I just doubt it's one thing.