The legislation enabling building codes and other targets of Lean Urbanism is often inspired by straightforward protection of health, safety and welfare, but then comes to serve many other purposes. Environmentalists have sought for many years to reform codes for new buildings to allow greater innovation, and Smart Growth advocates have worked since the ‘90s to reform building rehab codes. In some ways these efforts have been very successful, while in others they have left in place many impediments to a certain scale of development. This scale of development occurs in the inner city and in severely damaged suburbs and rural villages, and becomes more valuable to a locality when the market for larger-scale development disappears and is very sensitive to cost, delay and complexity. Additionally, legislative interventions are necessary to remove regulatory barriers that inhibit robust development at this scale. The method for identifying appropriate legislative adjustments to the building codes can be applied to other regulatory scenes which interfere with the revitalization of neighborhoods.