By October 1987, John Hay knew his luxury cave was not needed. He actually wanted to sell it for $4.5 million which would be about $10 million today. However, he was advised by his real estate broker advised him to reduce the price to a million dollars less. There was a potential buyer. He was a California biotech executive who seemed keen. In the year 2017, the Census Bureau Survey of the Median Price per Square Foot showed price on the market per square foot of a house would be $95.35 to about $148.45.