Roppongi Hills, privately owned and headquartered in Japan, was founded in 2003. The company operates one of Japan's largest integrated mega-complexes, functioning as a high-end "city within a city" in central Tokyo's Minato district. Developed by the Mori Building company, the complex integrates luxury retail, corporate headquarters, and high-end residential towers with cultural spaces. It is anchored by the 54-story Mori Tower, which serves as a hub for modern contemporary art and cityscape viewing.