Citizens Business Bank Arena (originally Ontario Community Events Center) is a multi-purpose arena, in Ontario, California, USA. It hosts local sporting events and concerts. Construction officially began on March 7, 2007 and the arena was opened on October 18, 2008. It is suitable for indoor events, including basketball, ice hockey, ice shows, boxing and concerts. The arena's basketball capacity is 10,832. It also seats 9,736 for hockey and its full capacity is 11,089. The 225,000-square-foot (20,900 m) venue also has 36 luxury suites on two levels. It is the biggest and most modern arena within the Inland Empire region of California.
The arena's construction cost was 150 million dollars, however, it was debt free due to the city selling different properties throughout the city. It was constructed on the old Ontario Motor Speedway property. The arena is owned by the city of Ontario and is operated by AEG Worldwide which operates arenas around the world and owns several sports franchises. The only tenant at the arena is the Ontario Reign of the ECHL which is owned by the arena's operator, AEG Worldwide and the Kemp Family.