With both teams failing to find new stadiums in a rough economic climate, the NFL is asking the 49ers and Raiders to discuss joining forces to construct a new shared venue. "The NFL has encouraged us to explore the possibility of a two-team facility to address the economics of building a new stadium," 49ers president Jed York said in an interview this week. "I think it's important you look at all of your options. If that's a possibility, that's certainly something we'll explore."