Many urban redevelopment projects have been implemented using Planned Development Design System (PDDS), which is one of the most common incentive FAR bonus systems in Japan, because of its flexibility. This study aims to clarify how the local municipalities have operated PDDS that the national government established around 45 years ago. In particular, we investigate how three cities (Tokyo Metropolis, Osaka City and Yokohama City) have changed their operational criteria of PDDS as they faced their own urban problems from time to time. Overviewing the changes of the national government's technical criteria of PDDS, we discuss the differences and similarities among the three cases.
Planned Development Design System brings results for the formation of urban area. However, many problems are pointed out in the system. On the other hand, as for the incentive system, utilization of the system is expected still more.This study paid its attention to discussions at the introduction of the Planned Development Design System. We analyzed the discussions and the final report of the Committee of Planned Development Design System, and compared them with the permission regulation and the technical standards of the system. As a result we clarified the important point of discussions and the difference with the realized system and the reason of it.
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