Dai-ichi Seimei Hoken Sogo-gaisha [First Mutual Life Insurance Co.] (often shortened to Daiichi Sogo) was founded in 1902, making it the oldest mutual insurance company in Japan. The firm relocated twice before beginning construction of a modern 7-story building at Kyobashi in 1915.
Designed by Tatsuno Kingo (who also designed, among other work, the Bank of Japan, Kokugikan (National Sumo Hall), and Tokyo Central Station), Daiichi Sogo Kan was one of Tokyo’s first skyscrapers. Completed in 1921, the building was damaged in the 1923 Great Kanto earthquake. Repaired and extensively renovated, the building remained standing until demolished in 1969.
In 2012, a new building bearing a similar but contemporized corner facade (called Sogokan 110) was completed on the site.