The present performance-based seismic design procedure has aimed to define and estimate the building performance in multiple levels using quantified parameters. Though this approach is very important for the improvement of performancebased seismic design procedure, it may be inefficient unless the engineer using the procedure is capable of developing preliminary designs that have the desired performance. The next generation performance-based seismic design therefore should address the development of design guidance that assists the engineer to design the desired performance including a reparability. In this research, the idea of the equivalent seismic loss spectrum is proposed. The equivalent seismic loss spectrum is visualized from the expected running cost to repair a building structure damaged by earthquakes throughout its lifetime. Then the proposed method is applied to R/C building structures, where the spectrum is shown as the relation between the expected seismic repair cost and the physical parameters related to structural performance.