Developers have a lot to gain by suburban retrofit, and many are jumping in at all scales—when they get support from municipalities. Ensuring that small builders and developers can participate is a challenge. Building codes—especially sprinkler requirements—can kill a small, infill mixed-use building. In order for developers to create urbanism, the ground has to be prepared (there has to be “fertilizer”). Coalitions of property owners can sometimes be incentivized by density increases to pay for walkable street network improvements but more often areas identified for this kind of growth in a visioning plan or comprehensive plan may need public infrastructure improvements before developers will be interested.