The end of 'bigger is better'? America's most expensive house sits unsold in sign of the times

For years architects, particularly in Los Angeles, have sought to outdo each other with ever more palatial residences featuring breathtaking infinity pools, in-home cinemas and flashy helipads. But questions are now being asked over whether the US has finally reached peak mega mansion. The biggest property so far is referred to by luxury estate agents as the "giga-mansion". Officially called "The One" it is America's largest and most expensive house and sits on a hill in Bel-Air, with 360 degree views of Los Angeles. Construction began eight years ago, when the sky seemed the limit for futuristic Bond villain-style lairs, and it was only very recently completed. Sprawling across 105,000 sq ft it features 21 bedrooms, 42 bathrooms, five swimming pools, a moat, a 50-seat cinema, and its own nightclub.