For accommodations for the team's arena, the biggest thing that I would never tolerate would there being like a square kilometer of asphalt and parking spots near the arena.  This makes it literally impossible to get to an arena for a game without the use of a car.  There should be some sort of public transportation options for the arena, and robust ones at that.  The easiest method is busing, with a large fleet of drivers able to move thousands of people if given sufficient money.  If done well, the arena would be in downtown instead of halfway across the county, and allow a wide assortment of buildings to surround the arena for food or entertainment before the game.  What exact companies, restaurants, or entertainment would immediately surround the arena, I don't really care.  The most fundamental aspect of the arena design should be making travelling as painless as possible.