10 Most Expensive Houses 4. Villa Les Cèdres by Ghani Khan Estimated Value: $410–$450 Million Villa Les Cèdres stands as a timeless symbol of French prestige and artistry. Built in 1830 and set amid 35 acres of beautifully sculpted botanical gardens in Saint-Jean-Cap-Ferrat on the French Riviera, this majestic estate offers a blend of historical significance, extravagant lifestyle, and pure opulence. The villa was originally constructed for the King of Belgium, Leopold II, reflecting his refined taste and immense resources.