Mitsubishi Estate Company, Limited is one of the largest real-estate developers in Japan and is involved in property management and architecture research and design. As of 2018, Mitsubishi Estate has the most valuable portfolio in the Japanese real estate industry, with a total value of approx. 7.4 trillion yen, much of which is located in the Marunouchi district of Tokyo. MEC owns Japan's third tallest building, the Yokohama Landmark Tower, as well as the Sanno Park Tower and Marunouchi Building in Tokyo. Mitsubishi Estate has its headquarters in the Otemachi Building in Ōtemachi, Chiyoda, Tokyo. It is one of the core Mitsubishi companies. Wikipedia