San Francisco 49ers
The team was founded in 1946 as a charter member of the All-America Football Conference (AAFC) and joined the NFL in 1949 when the leagues merged. The 49ers were the first major league professional sports franchise based in San Francisco. The name "49ers" comes from the prospectors who arrived in Northern California in the 1849 Gold Rush. The team is legally and corporately registered as the San Francisco Forty Niners. The team began play at Kezar Stadium in San Francisco before moving across town to Candlestick Park in 1970 and then to Levi's Stadium in Santa Clara in 2014.
Levi's Stadium
On February 20, 2015, the Raiders announced that they would be seeking a joint stadium in Carson, with the San Diego Chargers should they not receive public funding to replace the Oakland Coliseum, reducing the likelihood of the Raiders sharing Levi's Stadium with the 49ers. In January 2016, after losing their bid to relocate to Los Angeles to the Los Angeles Rams, the Raiders withdrew their request to move to Los Angeles, and joint tenancy at Levi's again surfaced in general discussion. However, with the Raiders getting approved for a move to Las Vegas and securing a local agreement for stadium funding there with Las Vegas Stadium under construction, it seems unlikely the Raiders will ever pursue a move to Santa Clara.