Odeon Tower By Alexander Giraldi, Larvotto Beach, Ligurian Sea, Monaco

A multi-storey penthouse in Monaco could become the world's most expensive property per square metre when it comes onto the market next year. The top floor penthouse could sell for £256m according to one estimate
Renowned for its casinos and yacht-filled marinas, Monaco has become a magnet for the richest and most discerning property tycoons in the world. Soaring to a height of 170m (557ft), the Odeon Tower will be the Mediterranean coastline's second tallest building. The twin towers will contain 70 luxury apartments with between one and six bedrooms. Also available will be two sky duplexes and a 1,200sq m penthouse. Topping out the block will be a spectacular 3,300 sq metre multi-story penthouse complete with private water slide and exclusive infinity pool. One estimate for the value of this apartment suggests it could fetch as much as £256m when it is released onto the market in 2014. Each apartment will boast floor-to-ceiling windows and private terraces with panoramic views of Monaco, Larvotto beach and the Ligurian Sea.