The house that helped trigger the downfall of Carlos Ghosn is a rose-colored mansion in one of Beirut’s most expensive neighborhoods.

Its walls were adorned with portraits of the automobile titan, who with his second wife had personally supervised the $15 million purchase and renovation of the property, people close to Mr. Ghosn say. Two ancient sarcophagi, unearthed during the remodeling, were visible through a glass floor leading to a wine cellar.

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