I M Pei location of office in 1960s?

Answer:
I. M. Pei and Associates moved uptown on Madison Avenue from 357? to 600 Madison, NW corner near 57th to an "undistinguished", according to Architectural Record magazine, office building. The office took up two floors, the 8th was for drafting staff, the 9th for the partners, associates and design staff.
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