Athletics Center Arena, or the O'Rena, is a 4,005-seat multi-purpose arena in Rochester, Michigan. It is home to the Oakland University Golden
Grizzles basketball team.
The facility opened November 16, 1998 with a 96-66 loss to Michigan State University in men's basketball. The opening of the O'Rena coincided
with Oakland's move from Division II of the NCAA to Division I.