In many foreign countries, the intensities of seismic loads are determined by the target seismic performance level. On the other hand, the seismic performance level of buildings is not explicitly taken into consideration in the Japanese Building Standards Act and most general buildings are designed according to seismic loads which is determined by the Standards Act without seismic performance level. This paper aim to implement seismic performance-based design in Japan and examine the seismic performance level of buildings designed on the basis of the Standards Act. Therefore, calibration against the Standards Act is conducted. In Part 2, probabilistic seismic performance evaluation is conducted for calibration of the Standards Act.