check out this arena largened on ign..

http://media.ps2.ign.com/media/552/552223/img_1968243.html

this arena looks huge...i bet you can fight in that building up at the balcony and then knock them through the door and onto the big circular arena, or you start in the lower building and knock them through the glass door into the circular arena. if you look at the door in the bottom building you can definettly see the inside.