The teams announced plans for the $1.7 billion stadium in Carson in a joint statement Thursday night.
The statement says the teams have tried for years to find stadium solutions in Oakland and San Diego, and both may be forced to move to remain economically viable.
The plan creates the odd prospect of divisional rivals sharing a home field. And it takes the already muddled issue of the NFL's return to Southern California and makes it downright messy.
St. Louis Rams owner Stan Kroenke is part of a joint venture to build a stadium in nearby Inglewood, and yet another plan remains alive for an NFL facility in downtown Los Angeles.