Prohibition Lounge in downtown San Diego's Gaslamp Quarter operates as the city's original speakeasy bar, hidden underground behind a door marked Eddie O'Hare's Law Office at 548 Fifth Avenue. The subterranean room's nightly live music program rotates jazz, blues, rockabilly, and soul acts starting at nine, a performance-bar format that Noble Experiment approaches with a cocktail-forward focus but without the stage presence. Bartenders work from a rotating menu of roughly 40 specialty cocktails refreshed monthly — a no-vodka bar built on bourbon, rum, and gin foundations — with signature pours like the Kentucky Tippler featuring Prohibition's own single-barrel bourbon, sarsaparilla bitters, and grapefruit zest. House rules enforce a no-cell-phones-at-the-bar policy and a weekend cocktail-attire dress code, behavioral standards that preserve the 1920s-era immersion differently than the open-format atmosphere at Vin de Syrah a few blocks south. Private buyouts convert the 85-to-100-capacity underground room into an exclusive event space for corporate receptions and milestone parties with live musical accompaniment and hors d'oeuvres service.