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The Graybar Building
Look here or. if in New York, go to 420 Lexington Avenue, hard by Grand Central, and look up. It's a big building, with all sorts of interesting Art Deco ornament, that might have caught the eye of Oleg, but not likely Mary, Grabar. It would have had to be big, and well-ornamented, in order to be noticed among all the imposing structures around that famous address at Lex and 42nd.
As the old New York saying puts it: De minimis non curat Lex.