This research clarifies the present condition of small-scale suburban developments, and aims to clarify problems which may happen in the future. This investigation examined five suburban developments outside city planning areas. As a result, it became clear that these developments are facing aging populations and an increasing number of vacant lots and vacant housing. Moreover, public transportation is quite poor and infrastructure maintenance is insufficient. Although about half the residents intend to continue living in these developments, we are anxious about residents leaving after reaching retirement age and the further aging of their populations.