This chapter describes the different developer obligations (DOs) instruments that have emerged in Chile. Since 1990, a progressive acceptance of DOs has occurred, related with the learnings from a “trial and error” process, particularly in the Metropolitan Region of Santiago (RMS, Región Metropolitana de Santiago). A lack of an appropriate legal framework has hindered the generalization of Dos, but not impeded their gradual acceptance. In addition to indirect rationales linked to finance, the needed infrastructure generated by new developments, public bodies are increasingly open to direct rationales. We conclude that the state needs to regulate and make transparent the growing negotiations in urban development.