As was the case with so many buildings that were "modernized" in the 1950s... the Penobscot Building had it's entrance lobby split up by floors.
Here is a rare image of the way the building looked when it was first built. Nowhere near as fancy as the Guardian Building, but the original multifloor lobby as built. By the look of it, it's possible that everything still exists behind drop ceilings and covered walls.
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