But before D.R. Horton breaks ground on its Ho'opili Project, it needs permission from the state.
The proposal is pitched as a mixed-use development, where people can live, work and play. But, with 33,000 area homes already in store, some say no more.
"Keep the farm don't sell the farm. We don't want anymore development," said Leeward Oahu resident Glenn Oamilda.
Outrage for Glenn Oamilda.
"It's going to be a negative process," said Oamilda.
For a week straight, he's turned the side Ft. Weaver Road into a canvas for his concern.
"We're concerned about the traffic, concerned about the impact it would cause water, electricity," said Oamilda.
He's collected more than 500 signatures for his petition to stop Ho'opili developer D.R. Horton from turning 1,500 acres of agriculture land into urban development. Drivers like Corrina Moefu keep pulling over.
"Once you build on ag land you can't turn back," said Leeward Oahu resident Corrina Moefu.
Groups like the "Friends of Makakilo" are furious. They say the 20-year project is worth billions and they haven't even seen a single sketch yet.
"They've been asked 12 times and haven't provided it," said Friends of Makakilo President Dr. Kioni Dudley.
"Jobs, a place to go to school and also homes," said D.R. Horton Developer Michael T. Jones.
The developer says area task forces and neighborhood boards favor building the community.
"Its always been in the Kapolei long range plan for decades and then formulated in the Ewa Development Plan in 1997," said Jones.
Those opposed say traffic will get even worse. But, the developer says future infrastructure will accommodate more people.
"There's going to be more roads our there, rail transit is going to be happening," said Jones.
"It will be a fatal blow," said Leeward Oahu resident Victoria Cannon.
People want to protect the prime ag-land and this time, they're putting their foot down.