Schaller's Pump is the oldest restaurant in the City of Chicago.  It opened at this location in 1881, but had a different name until it was purchased by George “Harvey” Schaller at the end of Prohibition era.  It's called "Schaller's Pump" because, in the old days, the beer was pumped in from a brewery next door.  The restaurant was frequented by at least five former Chicago mayors who hailed from the same Bridgeport neighborhood.  It's mere location, across the street from the local Democratic ward office, nearby the old union stockyards, and a short walk from Comiskey Park (er, U.S. Cellular Field), essentially confirms the notion that many plans and schemes affecting Chicago's history were hatched over drinks and dinner here.  Schaller's Pump remains a family business today.