instruction: Why do the San Francisco 49ers play in Santa Clara, California?
response: The San Francisco 49ers originally played at Kezar Stadium in San Francisco before moving to Candlestick Park in 1971.  When negotiations to build a new stadium fell apart they worked with the city of Santa Clara to build a new stadium which was located next to their training facilities.  Because of brand recognition and close proximity, the decision was made to keep the name, San Francisco 49ers.