The aims of this study are to clarify the actual condition of a complex of different businesses such as a spa facility, restaurants and shops as well as welfare service and to investigate the effect of the complex on social interactions. We tracked the behavor of users and staffs and, interviewed the service manager of the complex. It is shown that the S-facility is used by not only customers of welfare service but also various other users. Both direct and indirect social interactions are seen. The S-facility satisfies the requirements for an attractive place where many people gather.