This study investigated the impact of the GTX-A line opening on apartment prices in nearby areas. The study area was defined as a 2km radius around Kintex station in Goyang, Gyeonggi Province, and a total of 1502 apartment transaction records from Apr...
This study investigated the impact of the GTX-A line opening on apartment prices in nearby areas. The study area was defined as a 2km radius around Kintex station in Goyang, Gyeonggi Province, and a total of 1502 apartment transaction records from April 2024 to September 2025 were analyzed. Hedonic Price Model and Difference-in-Differences (DID) analysis were used to estimate the policy effect of GTX-A line on housing prices, while controlling for the physical and locational characteristics of each apartment. The average apartment price per square meter was 13.02 million KRW in station areas (within 500m) and 6.12 million KRW in non-station areas (between 500m and 2000m). When applying the 1000m standard, the station areas (within 1000m) price was 9.11 million KRW, and the non-station areas (over 1000m) was 5.86 million KRW. In Hedonic Price Model, variables such as unit floor area, total number of units, number 41 of floors, building coverage ratio, building age, and distances to elementary schools, parks, and existing subway stations were found to have significant effects on housing prices. The station-area variable showed an approximately 33% higher price level under the 500m standard and a 13% higher price level under the 1000m standard. The DID analysis revealed that, despite an overall market downturn following the opening of the GTX-A line (β=-0.057, p<.001), the interaction term (Post × Station Area) was significantly positive (β = 0.094, p<.001), indicating that apartment prices in station areas increased by an additional 9.8% compared to non-station areas. The analysis using the 1000m standard also showed a significantly positive interaction term (β=0.031, p=.042), indicating an additional price increase of about 3.2% compared to the area beyond 1000m. This result suggests that the opening of the GTX-A line generated a significant policy effect that enhanced housing values in station areas despite of the overall market downturn. This study demonstrated the post-opening market response based on actual transaction data, rather than pre-opening projections. This finding provide a foundation for future research seeking to evaluate the long-term and substantive impacts of large-scale transportation infrastructure on regional housing markets.