This study focuses on sustainable development in urban planning and develops a 21st century sustainable neighborhood. For empirical neighborhood design, urban design was conducted on a specific 5.2 ha site in Le Rheu Commune, France. Targeting a site with the attributes of ecologically based sustainable urban planning, this study derived a neighborhood design model using sustainable development strategy methods from environmental, economic, and social perspectives. Consequently, an infrastructure-based design was created, integrating and accommodating the infrastructure and various urban amenities necessary for the neighborhood. Additionally, infrastructure within the neighborhood was proposed as a design element for technology-based sustainable urban planning. This is a novel, empirical study based on urban planning theory. This theory-based empirical research model contributes to urban planning theory and the knowledge of urban planners and architects. Future studies should conduct urban planning research that combines sustainable neighborhood planning based on ecological infrastructure, as attempted in Le Rheu Commune, with the IoT, such as smart home care.