Call_me_jorge said: "In 2013 the Gershwin had a renovation where they expanded on the bathrooms and put in new seats. They did this for wicked 10th anniversary.
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I think that you're missing the point.
The OP was asking about renovations regarding the production to the physical space to enhance the show experience.
Heres my my two cents: Not exactly a renovation, but Bloody Bloody Andrew Jackson transformed the Jacobs during its run.