The Tsutenkaku Seismic Retrofit Project represents a landmark achievement in structural engineering and preservation. Completed in 2015 by Takenaka Corporation, this major renovation of Osaka's iconic Tsutenkaku tower introduced advanced base isolation technology to enhance earthquake resistance. Located in the Ebisu district, this transportation and cultural landmark underwent sophisticated seismic upgrading while maintaining its historical significance. The project demonstrates innovative approaches to retrofitting heritage structures for modern safety standards, making it an essential case study for architects interested in the intersection of historical preservation and contemporary seismic design practices in Japan.