San Francisco abandoned its bid to host the 2016 Summer Olympics after plans for a new bayfront stadium collapsed when the San Francisco 49ers gridiron football team said they intended to move to nearby Silicon Valley, according to The Associated Press. The announcement by the San Francisco 2016 Bid Committee on Monday left Los Angeles and Chicago as the remaining U.S. candidates to host the 2016 Summer Games. San Francisco 49ers club owner John York called city officials last week and said he was breaking off negotiations for a new stadium at Candlestick Point and was considering a move to Santa Clara.