In recent years, with the demand for urban regeneration and revitalization, there has been a growing momentum for the effective use of existing residential site and the renewal of buildings, and there is also a demand for cities to be more resilient against earthquakes. In this study, we investigated design methods that promote the effective use of piles from previous buildings, which would be an obstacle when renovating buildings, and the seismic resistance of retaining walls on existing residential site. These design methods are aimed to lead to the regeneration and resilience of cities and to improve the productivity of their design and construction.