Question: how many seats in the las vegas arena
Answer: 5 % ) Bill Foley ( 15 % ) Operator MGM Resorts International Capacity Overall : 20,000 Basketball : 18,000 Boxing / MMA : 20,000 Ice hockey : 17,500 Concerts : 12,000 -- 20,000 Acreage 16 acres Construction Broke ground May 1 , 2014 ; 4 years ago ( 2014 - 05 - 01 ) Opened April 6 , 2016 ; 2 years ago ( 2016 - 04 - 06 ) Construction cost $375 million Architect Populous Project manager ICON Venue Group Structural engineer Thornton Tomasetti Services engineer ME Engineers General contractor Penta Building Group Hunt Construction Group Tenants Vegas Golden Knights ( NHL ) ( 2017 -- present ) Ulti