Guests get a feel for life in the Gold Rush era in the new addition to the Old Sacramento underground tour. The basement space beneath the Hall Luhrs & Co. grocery store is small, the lighting over 19th-century artifacts dim. Guests will forget the modern plumbing of the building above and get a glimpse of historical life. The tour, which began Thursday, has guests start at the Sacramento History Museum and go straight to the Hall Luhrs & Co. building, where they learn about the unique part it played in the street-raising project. Guests then finish the tour at the underground space beneath the B.F. Hastings building, located at 128-132 J St., that originally made up the tour. “Sacrament