City officials and private developers unveiled a preliminary development plan Wednesday for a new community on Treasure Island that would include 6,000 homes, a school and 300 acres of open space.

Michael Cohen of the mayor's Office of Base Reuse and Chris Meany, who represented a group of developers, described to the Treasure Island Development Authority a plan that would be funded with taxes generated by increased property values and as a result would take no money from the city's budget.

The lead developer is Kenwood Investments, controlled by Democratic lobbyist and fundraiser Darius Anderson. Kenwood will work with Lennar Corp. and Wilson Meany Sullivan, which led the Ferry Building restoration.

The plan, which places an emphasis on sustainable "green" living, includes a ferry terminal, retail center, marina and eight neighborhoods, each with townhouses, flats and a 14-story residential tower.

Most housing units -- 1,800 of which will be priced below market rate -- will be clustered within a 10-minute walk of the ferry.  The plan calls for paid, central parking to encourage foot traffic, as well as a free intra-island shuttle. A congestion pricing scheme would levy an estimated $5 fee on motorists driving on and off the island during commute times.

The project will be reviewed by the development authority board and a citizens group, and will probably go to the Board of Supervisors for a vote by the end of the year, Cohen said. Building could begin in early 2009, he said