He started a technical college in Longview TX name after him. I suspect this lady owns many "jumping jacks" (oil wells)! The good thing is that she probably also owns the mineral rights to the land her house sits on.
Leila is a grand-daughter of R.G. LeTourneau, founder of LeTourneau University and the earth moving magnate. Her father was Richard, former president of the University.
I really doubt that the house is that extravagant, none of the family really lives an extravagant life style. I also would doubt that she owns the mineral rights, those don't transfer like normal property rights.