Yurakucho was named after Oda Urakusai, a younger brother of Oda Nobunaga. Urakusai, who was also renowned as a tea master, received a residence from the Tokugawa Shogun under whom he served after the battle of Sekigahara. SInce Urakusai's residence was located at Sukiyabashi Gomon, the town was called Yurakucho.
Grid-shita is the favorite Izakaya (Japanese Bar and Grill) spot for Japanes business men those who especially work around Tokyo Station and Kasumigaseki. There are 100s of restaurants and Izakaya located under the train grid.