The document discusses an "emergent neighborhood model" for urban design that focuses on designing urban nuclei, main streets, pedestrian sheds, and sanctuary areas rather than predefined neighborhoods. It argues that neighborhoods emerge organically based on the spatial structure of a city, including transportation networks and administrative boundaries. The model proposes placing urban nuclei in optimal locations and allowing neighborhoods to form around multiple nuclei. It also discusses designing for a 400-meter rule between main streets and sanctuary areas to generate a gradual urbanization process. Examples from Tel Aviv and London are provided to illustrate how this model can integrate green space and transportation networks.

1. Urban Nuclei and the Geometry of Streets: the Emergent Neighborhood Model Michael Mehaffy Sergio Porta Nikos Salingaros Yodan Rofe

3. The modern destruction of urban structure: The neighborhood unit + the functional hierarchy of streets

4. The new urbanist model: neighborhood unit, transit and non-hierarchical street design Doug Farr’s diagrams