Construction of wooden buildings of four-stories or more was restricted by the Building Standard Act Enforcement Order, which required use of diagonal beams and metal materials and adoption of a concrete foundation, and also by the Fire and Disaster Management Act.
消防法や建築基準法施行令によって4階以上の木造建築の建設は筋交や金物の使用、コンクリート基礎とする必要があるなどの制約を受ける。