The Citizens Business Bank Arena, originally known as the 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, for hockey it seats 9,736, 11,089 is the arena's full capacity. It is the biggest and most modern arena within the Inland Empire region of California.