In recent years, a phenomenon known as Hollowed-out City has been occurring in existing urban areas, caused by the increase in vacant houses and lots. Simultaneously, the dense clustering of buildings is also problem. This study focuses on the site replotting-type land readjustment project as a countermeasure to this issue in Hojyozu District in Imizu City and Iizuka-Hommachi East District in Iizuka City. The objective is to clarify their implementation process of these projects from the planning phase to post-project land use. The findings indicate that in these two areas requiring urgent intervention, regulatory flexibility within the land readjustment system led to faster project completion. Additionally, combining the project with other initiatives and systems aimed to enhance effectiveness of these projects. On the other hand, there was a risk that difficult-to-use plots like small or irregular would remain underutilized in the long term.