This paper focuses on the policies and implementation methods applied to the emerging issue on increasing vacant houses in each of 23 Wards of Tokyo, and it is approaching on the active treatments for vitalizing the reuse of vacant houses with public-private partnership, following the categorization of the implementation methods into two types; passive and active. Based on the investigation on the implementation methods by each of 23 Wards, this paper particularly focuses on the leading local governments, such as Toshima, Adachi, and Ota Wards, which have been progressively practicing their own active methods. As results, it characterizes each of the organization systems conducted by these governments as leading models, and clarifies the requirements for the active reuse of vacant houses from the views of target area, process, and method.

This paper focuses on the commercialization and transformation process of the inner district, which is located in back side of main avenues under the rapid urban development situation, and aims to clarify the factors of forming the unique lively mixed use environment through the case study on Harajuku District in Tokyo. By reviewing the building use and ownership changes for the past 50 years, it clarifies that the district's transforming process consists of four phases in relation to economic booms. Consequently, it clarifies the factors to transform from residential-based to lively mixed use in inner blocks from the views of building use, city planning system, and community organization.

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