Cellarmaker Brewing Co., a small SoMa taproom whose beer is arguably San Francisco’s best, will expand operations with a second location. The brewer will move into what’s currently the home of Old Bus Tavern, a brewpub at 3193 Mission Street, which is closing after September 8th.

Cellarmaker’s popularity has outmatched its modest 1150 Howard Street space, where owners Connor Casey, Tim Sciascia, and Kelly Caveney have brewed since 2013. Their 10 barrel system (one barrel is 31 gallons) in SoMa produces a limited number of kegs for distribution and occasional limited release cans. Most of Cellarmaker’s beer — like IPAs named for David Bowie songs and a cult-favorite smoked porter called Coffee and Cigarettes — is consumed on premises.

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Operating in the Old Bus Tavern space won’t drastically boost Cellarmaker’s production. 3193 Mission has just a four barrel system with three, 8 barrel fermenters. But the second location will offer space to further experiment, and some new territory: Food, which Cellarmaker doesn’t serve in SoMa. Specifically, plans are to offer Detroit style square pizza.

Stay tuned for more as the 3193 Mission brewpub changes hands; According to owners, Cellarmaker’s southern outpost is due to open in November.