The Bradbury Building is the oldest commercial building remaining in the central business district of Los Angeles. Built in 1893, it isn't much to look at from the outside, but the interior is impressive. An atrium lights the wrought iron railings and the cage elevators. Be sure to go inside after finding the cache.
Another of the area's gems is located across the street. The Grand Central Market houses an eclectic mix of shops--butchers, bakers, but not candle stick makers from what I can tell. Cross the street and check it out. Angels Flight is on the other side of the block from Grand Central Market. Recently returned to service after a lengthy shutdown because of an accident, it's worth a look-see.