By Les Christie @CNNMoney August 26, 2014: 12:06 PM ET
A billionaire's row
One of the world's largest apartments is going up in one of world's smallest countries. It's a 35,500-square-foot, five-story penthouse being built on a tower in Monaco, a nation ofless than a square mile.
The Sky Penthouse will also probably be the most expensive apartment ever built, expected to sell for nearly $400 million.