Oscar De La Hoya, 45 – $18.5M
Former world champion Oscar De La Hoya became an MMA promoter in 2018 and has been a boxing promoter since 2002. Of course, the Golden Boy, as he is dubbed by the media, is best known for his professional boxing career as he held multiple championships in multiple categories. BoxRec ranked him #11 on the all-time best boxers list. Oscar sold his Bel-Air mansion back in 2002 for a reported $5.5M. The last time it was on the market was in 2015, with an asking price of $18.5M. This mansion has 10,369 square feet of living space, 9 bathrooms, 8 bedrooms, workout areas, a sauna, a sunroom, and other amenities.