Al Corbi’s residence in the Hollywood Hills has the requisite white walls covered in artwork and picture windows offering breathtaking views of downtown Los Angeles, but it has more in common with NSA headquarters than with the other contemporary homes on the block. The Corbi family doesn’t need keys (thanks to biometric recognition software), doesn’t fear earthquakes (thanks to steel-reinforced concrete caissons that burrow 30 feet into the private hilltop) and sleeps easily inside a 2,500-square-foot home within a home: a ballistics-proof panic suite that Corbi refers to as a ‘safe core.