Max Format:
Complete Arena has 774075 Polygons.
The backstops have meshsmooth applied.

Obj Format:
Complete Arena has 777071 Polygons.
The court with backstops is saved separately in 3 different resolutions ranging from 43559 to 237229 Polygons.
The lowest poly-version is the SubD. hull. So you can use it easily as SubD in Maya/XSI or any software supporting SubD.

3ds Format:
Complete Arena has 1509013 Polygons.
The court with backstops is saved separately in 3 different resolutions ranging from 76606 to 464346 Polygons.

Previews rendered in XSI.