instructional tapes. Investments Schwarzenegger transferred profits from the mail-order business and his bodybuilding-competition winnings into his first real estate investment venture: an apartment building he purchased for $10,000. He would later go on to invest in a number of real estate holding companies. Stallone and Schwarzenegger ended their longtime rivalry by both investing in the Planet Hollywood chain of international theme restaurants (modeled after the Hard Rock Cafe) along with Bruce Willis and Demi Moore. However, Schwarzenegger severed his financial ties with the business in early 2000. Schwarzenegger said the company did not have the success he had hoped for, claiming he wanted to focus his attention on "new US global business ventures" and his movie career. Schwarzenegger also invested in the Easton Town Center, a shopping mall in Columbus, Ohio. He has talked about some of those who have helped him over the years in business: "I couldn't have learned about business without a parade of teachers guiding me... from Milton Friedman to Donald Trump... and now, Les Wexner and Warren Buffett. I even learned a thing or two from Planet Hollywood, such as when to get out! And I did!" He has significant ownership in Dimensional Fund Advisors, an investment firm. Schwarzenegger is also the owner of Arnold's Sports Festival, which he started in 1989 and is held annually in Columbus, Ohio. It is a festival that hosts thousands of international health and fitness professionals which has also expanded into a three-day expo. He also owns a movie production company called Oak Productions, Inc. and Fitness Publications, a joint publishing venture with Simon & Schuster. In 2018, Schwarzenegger partnered with LeBron James to found Ladder, a company that developed nutritional supplements to help athletes with severe cramps. The duo sold Ladder to Openfit for an undisclosed amount in 2020 after reporting more than $4 million in sales for that year. Restaurant In 1992, Schwarzenegger and his wife opened a restaurant in Santa Monica called Schatzi On Main. Schatzi literally means "little treasure," and colloquially "honey" or "darling" in German. In 1998, he sold his restaurant. Wealth Schwarzenegger's net worth had been conservatively estimated at $100 million to $200 million. After separating from his wife, Maria Shriver, in 2011, it was estimated that his net worth had been approximately $400 million, and even as high as $800 million, based on tax returns he filed in 2006. Over the years,