From 1894 to 1921, the Hattori Clock Tower stood on the site that Wako occupies today. In 1921, the Hattori Clock Tower was demolished to rebuild a new one. The reconstruction was delayed due to the Great Kantō earthquake of September 1, 1923. The new tower was completed in 1932 as the K. Hattori Building. In homage to its predecessor, the new store was also fitted with a clock.