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Here is what I could find about the architecture of Santa Monica post office building as obtained from Santa Monica Mirror
"AtXXXXX the Main Post Office is another of the splendid products of the federal government’s Public Works Administration, which flourished in the 1930s. Designed by Neal A. Melick and Robert A. Murray, the simple one- story building is distinguished by splendid Zigzag Moderne ornamentation – inside and out"
Hope this helps.