Orange County supervisors agreed Tuesday to give backers of the non-aviation plan to replace the El Toro Marine Corps Air Station three weeks to fine-tune their proposal.
The board voted unanimously to allow the El Toro Reuse Planning Authority to refine its Millennium Plan, which would put a park, homes, office space and a museum on the 4,700-acre Marine base, scheduled to close in July.
Supporters of the plan say they might reduce development in their proposal to curtail the amount of traffic the proposal would generate.
The three-week extension came as the board on Tuesday approved, on a 3-2 vote, a new plan for an international airport on the site. County planners decided to do away with commercial development around the proposed airport and instead increase the amount of open space.
Planners said they had met with key real estate developers, who told them that plans for a commercial development on the property were unrealistic and would compete with other attractions around the county.