Lee Kun-hee, chairman of the world\'s top maker of smartphones Samsung Electronics Co., owns the most expensive houses out of the country\'s top 30 business leaders, data showed Monday. The combined declared value of houses held by the 30 business tycoons reached 157.7 billion won (US$148.4 million) at end-June, up 9.6 percent from a year earlier, according to the data by market researcher Chaebul.com.