F1, originally known as the Funaki Shogai Building, stands as a remarkable example of contemporary commercial architecture in Tokyo's prestigious Shiba Park district. Completed in 1990, this mixed-use structure was designed by the acclaimed architect Kita Kawahara Atsushi in collaboration with ILCD. The building seamlessly integrates commercial facilities and office spaces, reflecting the sophisticated design sensibilities of the late twentieth century. Its strategic location in Minato ward and thoughtful architectural approach make it a compelling case study for those interested in modern Japanese commercial design and urban development.