What bookstore in manhattan is it?

Hey!

So here's the thing. I've been once to New York (just Manhattan) and I found a bookstore. It was somewhere in the Midtown but I'm not sure. So, about the bookstore. It was huge, it had about 4 floors. The only thing I can remember is that on the highest floor there were just medical books and on the lowest floor there was like a whole "new bookstore". There were just big, white book-shelfs. And they were not completely filled with books. As far as I can remember on the lowest floor were just scientific books. And the last thing - it was not Barnes&Noble. Does anyone know what kind of bookstore it was? And where it is exactly?

Thanks in advance

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