Jeff Bezos’ mystery neighbor slashed $50 million off the listing price of an empty waterfront lot next to properties owned by the billionaire in an exclusive neighborhood in South Florida.

The plot in Indian Creek Village, an artificial island that has been dubbed “Billionaire Bunker,” was listed about three months ago for $200 million, but its asking price has since been reduced to $150 million, according to Ilya Reznik, the agent marketing the property for sale.