RJB: I thought your model was of the RR Donnelley Building but I did not realize the building had been renamed until I googled. I think you have set a new record for the employment of technic parts on a microscale skyscraper.
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A friend of mine in MichLUG, Scot Thompson, built a new minifig model of One Detroit Center that exceeds in size my Penobscot Building. I was looking forward to seeing it at the Detroit Design Festival the previous week but the top of it fell apart in transit so he was able to display only the first 8 feet of the building:
One Detroit Center is the big gray and tan building in the middle.