This paper explains the process of increasing coastal vulnerability in response to coastal flooding, from the property market viewpoint. Rooted in knowledge about housing submarket-based neighborhood change, this study adds new understandings of how housing obsolesces influence vulnerability following rapid land use changes, which are currently studied as a new exposure by many researchers. We employ six years of house sales transaction data (n = 1,029) in a spatial data-driven delineation with k-means, through which the submarket shift can be visualized. This approach addresses weaknesses in the existing methods to measure neighborhood change. We find that second-hand houses purchased by low-income people tend to cluster close together in newly formed submarkets in at-risk areas creating submarkets for western-inner city and distressed properties. Our data series also show that the geographical growth of the submarket for distressed properties is expanding, creating further blight in the submarket for western-inner city. Consequently, the submarket for distressed properties tends to transform into an area characterized by substandard housing conditions or slum living. Bearing in mind that the consequences of a flood will cover a wide range of issues, such as the future of public services, and the welfare of citizens in general, disaster risk management is fundamental to socio-economic development of a country. This study can enrich discussions around housing vulnerability and neighborhood change and support the current debate over spatial adaptation and climate change.