In this period his work alternated Beaux-Arts with cubism, modernism, and art deco, of which examples are 2 Park Avenue (1927), using architectural terracotta in jazzy facets and primary colors, the Film Center Building in Hell's Kitchen (1928–29) and the Squibb Building (1930), which Kahn considered among his best work.
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As for ornamentation, Kahn, who earlier had been inspired by the abstract geometric forms of Moorish and Persian architecture, was, from the mid-twenties onward, highly innovative in adapting the new Art Deco style with polychrome cubist or zigzag motifs reflecting the Jazz Age.
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As part of her research for her novel The Fountainhead, Ayn Rand spent a half year in 1937 as an unsalaried assistant to Kahn in his offices in his 2 Park Avenue building, where he mentored her on the profession of architecture.
In 1942, Hoffmann's residence at 870 Park Avenue, NY was rebuilt in a "art moderne style" by prominent architect Ely Jacques Kahn.
Jacques Chirac | Jean-Jacques Rousseau | Ely | Jacques Offenbach | Jacques-Louis David | Jacques Brel | Jacques Lacan | Jacques Derrida | Bishop of Ely | Ely Cathedral | Jacques Cartier | Jacques Cousteau | Louis Kahn | Isle of Ely | Ely, Minnesota | Joseph Kahn | Jean-Jacques Goldman | Jacques Lipchitz | Jacques Higelin | Jacques Dutronc | Jacques Delors | Ely, Cambridgeshire | Jean-Jacques Annaud | Oliver Kahn | Jacques Rouvier | Jacques Rogge | Jacques Prévert | Jacques Villeneuve | Jacques Lanzmann | Jacques Hébert |
At New York University's new School of Architecture, he studied under Raymond Bossange and Ely Jacques Kahn.