The project has drawn heavy skepticism from many in Solano County, as well as at the state and federal levels.
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It first started several years ago after Silicon Valley billionaires secretly bought $800 million of land to develop near Travis Air Force Base.
VIDEO: Sierra Club calls California Forever's plan for new Solano Co. city a 'hostile takeover'
Sierra Club calls plan for new Solano Co. city a 'hostile takeover'
The company's CEO, Jan Sramek, says the county stands to benefit from the project.
"This is by far the best site that we have in Solano County, in the Bay Area, and probably the entire state for a project that can really make a difference," Sramek said.
During a presentation, Sramek talked about the long-term economic boost it could provide.
He mentioned everything from the creation of white-collar jobs to new infrastructure and a safe city to raise a family.
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EXCLUSIVE: CEO behind massive Solano Co. land grab shares vision for new 'most walkable' city
EXCLUSIVE: CEO behind Solano Co. land grab shares new city vision
It was a tough sell to many in the audience.
"I may be more skeptical now than I was walking into it. With the job guarantees, the lack of talk about affordable housing," said Phillip Balbuena.
Despite the heavy pushback that the project received during Wednesday's town hall, the developers say they believe the majority of Solano County is actually behind them.
"The people who are creating this panic about it are the same people who on another project would be talking about some tree, on another project they'd talk about noise, on another project they're talking about views. Some people just hate development," Sramek said.
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MORE: Firm that purchased nearly $1B of land near Travis AFB admits waiting 5 years to inform military
The Vallejo town hall was the first of eight that California Forever plans on hosting around Solano County in the coming weeks.
Many locals though say if the company really wants to help, it would be better off investing in communities that are already there.
"Work with what you have and make it better. But the idea of saying, I'm going to take my little marbles and play my game over here is unfair," said Paula Conley.