Owner: Tamara Ecclestone, daughter of Formula One billionaire Bernie Ecclestone
Purchase Price: 45 million pounds in 2011 (roughly $70 million)
Estimated Construction Costs:20 million pounds (about $30 million)The heiress has spent an estimated $98.7 million on a 55-room house (not pictured) on Billionaire's Row factoring in renovations that include a $1 million Amazonian crystal bathtub, a private nightclub, a bowling alley, a subterranean swimming pool, a beauty salon, a dog spa and a car lift.