What is the term for mid-sized developments built with the intentions of self-sustainability?

Planned Unit Development (PUD) refers to a type of community development that is designed to provide a coordinated approach to land use and development within a specific area. PUDs are characterized by their mixed-use design, which often incorporates residential, commercial, and recreational spaces into a single development. This design allows for a greater degree of self-sustainability as the community can rely on local resources and amenities rather than depending on outside areas for various needs.

The concept of PUDs encourages efficient land use, promotes walkability, and fosters community engagement—all crucial factors for creating sustainable environments. By integrating different types of land use, these developments can minimize transportation needs, create vibrant neighborhoods, and ensure that residents have access to essential services within close proximity.

In contrast, mixed-use development focuses on combining various uses in a single building or site but may not necessarily have the same cohesive planning or community aspect that PUDs emphasize. Traditional neighborhoods primarily refer to established community layouts from different historical contexts, often lacking the modern emphasis on sustainable practices. Metropolitan areas represent broader regional centers and do not specifically refer to the concept of self-sustainable mid-sized developments.