The building was largely unaffected by the Great Kanto Earthquake of 1923 due to its steel-reinforced construction , but was gutted during the firebombing of Tokyo in 1945 , with only the exterior walls and floors remaining intact . It re-opened in 1950 with various modifications including a re-designed tiled roof
Great Kanto Earthquake
1923 Great Kantō earthquake
Old Ministry of Justice Building