World's Most Expensive Real Estate: $9,500 a Square Foot

The just-completed One Hyde Park apartment complex in London is notable for more than its A-list architecture and posh park views. At as much as $225 million a unit, it sets a real-estate record: a jaw-dropping $9,500 per square foot, making it the most expensive real estate in the world.

By way of comparison, the closest competitor in the States is the beachfront cottage in Carpenteria, Calif., that we wrote about last fall. At $5.3 million for a snug 641 square feet, it comes out to a paltry $7,000 per square foot.

So what does $225 million get you?