The in-game building is based on the real-life National Diet Building in Tokyo's Chiyoda city, whose construction was completed in 1936.
Kazuma Kiryu and Makoto Date come to the National Diet Building to meet Minister of Defence Ryuzo Tamiya. After he tells them about Black Monday and its significance to the Okinawa resort and military base plan, security guards working for rival minister Yoshinobu Suzuki surround the building. Kiryu tells Date to escape out of the back using his press credentials whilst he fights the guards. Eventually, Goro Majima rescues Kiryu by driving a dump truck into the crowd of guards.