Keystone Underground Martini Bar was a martini & jazz club in the basement of Ypsilanti's Kresge Building, underneath J Neil's Mongolian Grille. Opening in mid-2009, it hosted the Paul Keller Orchestra after the closing of Ann Arbor's Firefly Club. Keystone closed in 2010, a casualty of the financial issues that brought down all of owner Dave Curtis's venues.

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