When abandoned or underutilized urban areas are converted to urban parks, the introduction of a new urban park could lead to gentrification of adjacent neighborhoods by attracting more people into the place. This study investigates recent gentrification in Mapo-gu district, Seoul, where a new urban park, Gyeongui Line Forest Park, is built, and explores the role of the park in this neighborhood change process. In this study, 39 types of restaurant opening data between 2011.04 and 2017.06 were used to capture the impact of Gyeongui Line forest park. Using the Difference In Difference model, we measure the effect of Gyeongui Line forest park construction on nearby area. We measured the impact of the park, which appears to be spatially different. The results show that the park plays an important role in the gentrification process. And it was confirmed that the effect of the park on the commercialization of the surrounding area varies according to the characteristics of the neighborhood.