Study on the Impact of Social Infrastructure on Apartment Prices: Focusing on the Case of Seoripul Tunnel in Seoul

This study aimed to understand the impact of social infrastructure investment on apartment prices. Using a difference-in-differences(DID) regression analysis, we empirically analyzed the impact of the new establishment of infrastructure on apartment prices in Bangbae-dong, Seoul by the commencement and completion of the Seoripul Tunnel, examining the effects step-by-step and by distance from the street using buffer analysis. Our findings revealed that the influence on apartment prices varied depending on the commencement and completion stages. For the commencement phase, a significant increase in actual transaction prices was observed within 500m when comparing 6 to 9 months before and after the construction started. On the other hand, during the completion phase, no significant influence was observed at the exact time of completion. However, when considering three months before completion, statistically significant positive changes were observed in both the subsequent 9 months and within distances of both 500m and 1km. This research provides an empirical evidence of the actual fluctuations in apartment prices due to large-scale social infrastructure investments in the area. The effects of social infrastructure on housing prices can manifest differently across time and distance from it. Such complexities suggest that related policy responses require much more careful research.