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The exterior of Santa Clara Stadium, the future home of the NFL's San Francisco 49'ers, in Santa Clara, California March 6, 2013. The stadium is scheduled to open in time for the 2014 NFL season. REUTERS/Noah Berger

Construction continues at Santa Clara Stadium, the future home of the NFL's San Francisco 49'ers, in Santa Clara, California March 6, 2013. The stadium is scheduled to open in time for the 2014 NFL season. REUTERS/Noah Berger

San Francisco 49'ers CEO Jed York speaks to reporters at Santa Clara Stadium, the future home of the NFL's San Francisco 49'ers, in Santa Clara, California March 6, 2013. The stadium is scheduled to open in time for the 2014 NFL season. REUTERS/Noah Berger

The exterior of Santa Clara Stadium, the future home of the NFL's San Francisco 49'ers, in Santa Clara, California March 6, 2013. The stadium is scheduled to open in time for the 2014 NFL season. REUTERS/Noah Berger

Workers check construction near a lighting array atop Santa Clara Stadium, the future home of the NFL's San Francisco 49'ers, in Santa Clara, California March 6, 2013. The stadium is scheduled to open in time for the 2014 NFL season. REUTERS/Noah Berger

A worker welds a support at Santa Clara Stadium, the future home of the NFL's San Francisco 49'ers, in Santa Clara, California March 6, 2013. The stadium is scheduled to open in time for the 2014 NFL season. REUTERS/Noah Berger

Construction continues on a luxury suite section at Santa Clara Stadium, the future home of the NFL's San Francisco 49'ers, in Santa Clara, California March 6, 2013. The stadium is scheduled to open in time for the 2014 NFL season. REUTERS/Noah Berger

Construction continues on a luxury suite section at Santa Clara Stadium, the future home of the NFL's San Francisco 49'ers, in Santa Clara, California March 6, 2013. The stadium is scheduled to open in time for the 2014 NFL season. REUTERS/Noah Berger

A worker passes an opening at Santa Clara Stadium, the future home of the NFL's San Francisco 49'ers, in Santa Clara, California March 6, 2013. The stadium is scheduled to open in time for the 2014 NFL season. REUTERS/Noah Berger

The exterior of Santa Clara Stadium, the future home of the NFL's San Francisco 49'ers, in Santa Clara, California March 6, 2013. The stadium is scheduled to open in time for the 2014 NFL season. REUTERS/Noah Berger

San Francisco Mayor Ed Lee (C) and Santa Clara Mayor Jamie Matthews (L) tour Santa Clara Stadium, the future home of the NFL's San Francisco 49'ers, in Santa Clara, California March 6, 2013. The stadium is scheduled to open in time for the 2014 NFL season. REUTERS/Noah Berger