Stada Vecchia, Bel Air, California Full circle: The fact that this was a Gwathmey-Siegel home was meaningless to me when construction was eminent in the late 90's. Later I came to find out how prominent Mr. Gwathmey was when I was writing a report about home styles. Pile supported downslope retaining walls. Buttress fill. Old, repaired slope failure. Basement Lots of piles