Mitchell Stewart, 48, who owned the local music venues the Vault 350 in Long Beach and the Malibu Inn in Malibu, died Sunday of an apparent heart attack at his home in Calabasas, his family announced.
After purchasing a historic 1920s bank building in downtown Long Beach for a reported $3.8 million in 2003, Stewart opened the Vault 350 the next year.
The nightclub often hosts nationally touring acts and can hold 1,500 people.
A few years ago, Stewart bought the Malibu Inn and made a key upgrade to the restaurant and nightclub by building a legitimate stage, The Times noted in 2004.
With his wife and business partner, Nurit Petri, Stewart was working on opening a jazz and blues supper club next to the Vault 350.
Born in 1959 in Louisiana and raised in Illinois, Stewart earned a bachelor's degree in economics at the University of Minnesota in 1981.
After working as a securities trader, he opened a mortgage bank in 1993 in Long Beach.
A father of four, Stewart also had a home in Malibu.