When Hacienda de la Paz listed for $53 million in 2013, the Los Angeles Times ran a significant feature, as did news outlets as far afield as London’s Daily Mail. ABC News’ Good Morning America dubbed the 51,000-square-foot estate the “Underground Mansion” for its stunning subterranean amenities.

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This year the nine-bedroom, 8-acre compound is back on the market for the same incredible price. In Rolling Hills, a gated city on Palos Verdes Peninsula in Los Angeles, the home techn…