Property: a 16,000 square-foot Mediterranean-style estate Billy built from scratch in Hidden Hills complete with six-bedrooms and eleven-bathrooms and super luxe features like a basketball court and home theater.
Story: the Tae Bo mogul turned his fitness industry success into a profitable real estate investment. He purchased the land for $1.4 million in 2000 and built a massive estate on it shortly thereafter. After several price reductions, he eventually sold the property for $7.3 million in 2012.
Profit: $5.9 million