Football Configuration-14 Rows added to lower level 
Track and Field ConfigurationThis is a diagram of a project I've been trying to figure out for a while. A new LA coliseum is the centerpiece of NFL expansion efforts and the Los Angeles 2016 bid for the Summer Olympics. The existing coliseum was built in 1923, and has hosted just about every major outdoor sporting event in the United States. LA Coliseum is much like early Soldier Field and JFK Stadium in Philadelphia, track and field stadiums at or near 100,000 capacity but not great venues for football due to the size of the playing field.
The LA Coliseum's major flaw was that the length of the field was about 650 feet, even longer than necessary for track and field, and was awful for football which has only a 360 foot field. Then when the stadium was remodeled after the earthquake, the field was lowered, rows of seats were added toward the field, the football gridiron was moved to the West end of the field. and temporary bleachers were added on the east part of the field. This improved the stadium as a football venue, but cut out the most important architectural feature from spectator view, the peristyle arches and olympic torch at the East end of the stadium.
My plan would construct a new two-level grandstand along the sidelines, while retaining the original peristyle entrance and East end seating. For football, capacity would be 81,500, and USC football can fill those as we've seen. The lower bowl would have 57 rows. The lower 14 rows (bright red) would be removed for track and field events, and the upper 8 rows along the sidelines would contain 6,000 club seats (gold). 76 suites would sit behind the club seats, and 26 more would be in a South tower above the second level, for a total of 102 suites. The upper levels along each sideline would hold 27,000. The stadium configuration wouldn't be quite as long as the existing Coliseum, so both ends of this new stadium could be used for football seating.
To convert to track and field, the lower 14 rows (About 10,000 seats) would be removed and the field raised about 16 feet, so the track wouldn't sit below the sightline of the spectators. Then about 4,000 seats would be added above the West end of the stadium, raising capacity back to 75,500 for track and field. This work could be done between the end of football season and the beginning of the Olympics, and football could still be played with the track and field configuration the season after the Olympics, but sightlines wouldn't be as good.
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