 Baseball stadiums that converted to football stadiums had more of an obtuse angle between the stands.This made the football viewing farther away, and in some cases partially obscured as in Candlestick Park.In the case of Qualcomm Stadium, it was constructed with half of the field-level seating permanent (built of concrete, in the southern quadrant of the stadium), and the other half portable (modular construction using aluminum or steel framing).