The roots of Mitsubishi Jisho Design lie in the Marunouchi Architectural Office, the architectural design firm
founded in 1890 which designed Japan’s first modern office building, the Mitsubishi Ichigokan (Building No.1). Over the subsequent decades, as the country modernized, the firm went on to design a series of iconic brick buildings in the central Marunouchi district of Tokyo, the national capital. In the 1960s, responding to rapid economic growth and the burgeoning demand for office space, the area was transformed into a harmonious central business district, with new buildings designed to conform to a uniform height of 31 meters. In the 21st century, these buildings have been replaced with high-rise towers and the area has been reimagined once more as a lively district with vibrant commercial and cultural functions.