The World's Most Expensive Apartment

Set to be the world’s most expensive apartment upon completion, The Sky Penthouse is well under construction. Located in Monaco, the 35,500-square-foot penthouse is slated to hit the market with a cool $400 million USD price tag. With features such as floor-to-ceiling windows, state of the art architecture, and a large terrace with a pool, it is safe to bet that one out of the approximately 30 percent of Monaco inhabitants who are millionaires will be eager to add this to their property portfolio.