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Mikkeller Bar's vast selection of brews has already put the new Tenderloin beer joint on the map, but they've now got another thing on tap: a hidden cellar space pouring exclusively lambics and sour beers. Named after the 19th-century Tivoli Beer Garden on Sutter Street, the new Tivoli Sour Room features whimsical art by Keith Shore, a nifty aquamarine epoxy floor and a white oak communal table, plus a couple of two-tops near window portals into the bar's complicated tap system. All told, the cozy space only seats 20 and has a selection of about 80 specialty bottles. Hours for the sour room are Thursday-Saturday from 6pm-2am; it's available other days for private parties. [EaterWire]