Kyiv is the undisputed center of business and commerce of Ukraine and home to the country's largest companies, such as Naftogaz Ukrainy, Energorynok and Kyivstar. In 2010, the city accounted for 18% of national retail sales and 24% of all construction activity. Indeed, real estate is one of the major forces in Kyiv's economy. Average prices of apartments are the highest in the country and among the highest in eastern Europe. Kyiv also ranks high in terms of commercial real estate for it is here where the country's tallest office buildings (such as Gulliver and Parus) and some of Ukraine's biggest shopping malls (such as Dream Town and Ocean Plaza) are located.