Arthur Loomis Harmon | |
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| Born | July 13, 1878 Chicago, Illinois, U.S. |
| Died | October 17, 1958 (aged 80) White Plains, New York, U.S. |
| Alma mater | Columbia University |
| Occupation | Architect |
| Practice | McKim, Mead & White, Wallis & Goodwillie, Shreve, Lamb & Harmon |
| Buildings | 740 Park Avenue, Empire State Building, 3 Park Avenue |
Arthur Loomis Harmon (July 13, 1878 – October 17, 1958) was an American architect. He is most famous as the design partner of the firm Shreve, Lamb and Harmon.