Since September 1, 2001, when the original proposal was launched, a group of people have worked to design a process and a plan to get started. A long series of proposals have been debated and submitted on four occasions to Mayor Lee P. Brown, who has always reacted positively, and has encouraged the beginning of the process.
The following list includes the major versions (City Planning Director Robert Litke notes that there have been at least 15 versions) of the proposal to plan, beginning with the most recent and going backward: