This study examines the impacts of the Guangzhou–Shenzhen–Hong Kong Express Rail Link on residential property prices in West Kowloon, in which the terminus and only station of the Hong Kong section of the high-speed rail link is located. The express rail is characterised as being a link between Hong Kong and her motherland, China, which is a major source of property buyers in Hong Kong. We investigate if there is an east-west connection premium introduced by the project by examining spatial and temporal changes of property prices in affect areas. Based on a sample of 282,131 transactions, this study uses the hedonic pricing and repeat sales models to examine whether property prices in West Kowloon rise because of the development of the high-speed rail which signifies a link between Hong Kong and China and whether they drop because of the 2019 political movement which emphasizes a decouple. We found significant and consistent evidence to support these hypotheses from both the hedonic price and the repeat sales models. The accessibility premium was capitalised in property prices since the announcement of the project, and the size of the premium is the largest during the announcement period. However, the east-west connection premium was significantly offset by the recent political unrest events, with properties located nearest the West Kowloon Station being affected the most. We derived policy implications regarding practical implications for the design and implementation of land value capture schemes and urban planning.