Hillsborough has mansions, but huge, castle-like estates situated on enough land to establish a national park – 835 Chiltern Road has the exclusive on those details. The property, billed by Christie’s International as “one of the West Coast’s largest private residences,” includes a 5 bedroom main house and nearly 36,000 square feet. The property also boasts three separate apartments …. and a guest house, all of the residences resting peacefully on more than six acres of private park land. Built in 1992, the estate manages to straddle the atmosphere of an Elizabethan castle—yes, those are actual 15th century Gothic doorways you’re drooling over– with all (and we do mean all) of the amenities: indoor and outdoor pool; gym; racquetball, squash and tennis courts; library; home theater; master suite with his and her dressing rooms; 13 fireplaces, offices and an art gallery. Outside are fruit orchards, English gardens with a maze, waterfalls, koi ponds and bay views. All that splendorat only $48,888,000. Don’t have the cash on hand? Finance it for a mere $258,050 a month. You could pay the mortgage here or buy a new house every month or two somewhere else; but something tells us those houses won’t look quite like 835 Chiltern.