Tim Sheahan, president of the Golden State Manufactured-Housing Owners League, said Kubota's firm did not take advantage of the appeal because it wanted to shut the park down so it could be redeveloped with condos.
Tenant-rights advocates say that if rent control is phased out, many poor and elderly people will have no place to live.
"It would literally take the roofs off most tenants' heads who live in rent control jurisdictions," said Larry Gross, executive director of the Coalition for Economic Survival, a tenants' rights group in Los Angeles.
"Los Angeles would be hit the worst," Gross said. "Landlords would resort to any action, legal or illegal, to get those tenants out."
The removal of rent control also would make selling mobile homes more difficult because buyers could face years of unregulated rent increases for the land their mobile homes occupy, Sheahan said. "It would be devastating," he said.
Kubancik said that with the increase scheduled for April on her Blue Star lot, her rent will have risen about 65% in three years.