THE most expensive house in the world is going on sale for up to £860million pounds in the south of France. The 10-bedroom property, which comes with an Olympic size swimming pool, is in the billionaire’s playground of Saint-Jean-Cap-Ferrat, close to Nice. It has one of the most beautiful gardens in Europe, which includes 35 acres of manicured lawns, 15,000 plants, and some 20 greenhouses containing rare tropical vegetation. Close neighbours include British composer Andrew Lloyd Webber and US tech tycoon Paul Allen. Les Cedres is currently owned by Suzanne Marnier-Lapostolle, part of the Grand Marnier liqueur dynasty. She is said to be downsizing, and looking for a buyer who will care for a house that has been in the family since 1924. Some fifteen professional gardeners are currently employed by her full time, and she hopes all will be kept on. Saint-Jean-Cap-Ferrat, which currently has a population of just over 2,000, has attracted celebrities and royalty from all over the world throughout its history.