This project is refining/reviving of 40 year-old decrepit commercial building. It is located in a valuable place of a 1-minute walk from Shibuya station. The owner considered rebuilding it because of overage and deterioration. If it is rebuild, it must be setback 1 meter from its road boundaries and the floor space for rent decreases. For those reasons, he made decision that refine/revive the building to keep its existing floor spaces and shape. In the case of large-scale reviving construction, we have to certify that the building is law-abiding at first. After some kind of surveys, we restored its existing drawings. According to the drawings, we had considered and arranged the matter of laws and then, we certified that the existing building is originally law-abiding even though it is non-conformed building in the current lows. In this project, we received an application for building confirmation after the design stage and a certification of inspection after the completion. We reinforced it with considering the user's usability, at the same time, we refurbished its exteriors, renewed the stairs and established an elevator. For the renewal of the stairs, we had must to take down small beams. When we established new slab, we made a step between new and existing to open a space for equipments in an assumption of kitchen use. The pipe spaces are all placed the same position at each floors to make it is easy to maintenance. We tried to provide a broad utility for the building because moving and change of usages are usually repeated in commercial building. Moreover, we planed to ensure high modifiability to keep using in long-turn without large-scale construction when its tenant moves. Those plan as noted above contributed to refine/revive the building as long-lived building that will be used in the years to come.