From an interview at the following site:

http://www.knpr.org/LVIR/transcripts/jimcashman.txt

"....He went to the Union Pacific Railroad and talked to his friend, George Ashby, who was president of the Union Pacific at that time. And he sent a fellow by the name of Steve Hannegan out here, who did their public relations and publicity work for the Union Pacific. And he and Dad and a group of the local businessmen came up with this idea of an annual celebration called Helldorado. And the Union Pacific was really responsible for promoting it in L.A. and other areas that they were headquartered in...."

"....And after a while, it kept getting bigger and bigger and bigger, the celebration, and we even ran out of space at the Helldorado Village so we had to figure out something else to do. I say "we," I mean my dad and his group. So he went to George Ashby. Like I say, he was president of the Union Pacific at that time. And there were about 70 acres of ground down on North Fifth Street that belonged to the Union Pacific Railroad, where the original springs were. And he got George to get the Union Pacific to sell that ground to the Elks Lodge at $100 an acre for this particular project. And that was the start of what they call now Cashman Field...."