Perched on an impossibly high floor in Downtown Manhattan, with rows of enormous windows facing east, south, and west, Kay Olivia and Ryan Jackson’s duplex overlooks the Brooklyn Bridge, the World Trade Center, and the Statue of Liberty. As far as views go, it doesn’t get more New York than that. And yet the apartment’s interior, in a very modern and abstract way, calls to mind a Parisian address, what with its enfilade of reception rooms, floors covered in herringbone parquetry, and ecru stone mantelpiece anchoring the central salon, which is furnished with eclectic sofas in beige hues. “We got married in Paris, so we wanted to bring a little bit of…