In response to my own question about how much land the Vessels own:

“Frank “Scoop” Vessels III established the original Vessels Stallion Farm in Orange County, and built the Los Alamitos Race Course, with Frank Jr. taking over the business when his father died. He sold the properties in 1984 to buy 2800 acres in Bonsall.”

If you look up the Vessels ranch, there’s a huge vacant area around it.