IRVING – In a clear sign the St. Louis Rams might be concluding their Los Angeles relocation hopes are likely tied into bringing on a second team – and breaking the stalemate between their Inglewood proposal and the Oakland Raiders and San Diego Chargers stadium proposal in Carson – owner Stan Kroenke delivered a letter to the L.A. owners committee indicating a willingness to bring on a second-team partner.

According to a high-ranking league source, the letter provides the framework for a deal in which either the Chargers or Raiders would join the Rams in Inglewood.

According to the source the letter outlines a full 50/50 partnership on stadium costs and stadium use for whichever team joins the Rams in Inglewood.

The partnership deal is exclusively for the stadium.

Another source revealed the Raiders or Chargers will have access to all team game-day revenue streams including parking and sponsorship. The source stressed the letter is not intended to serve as a defined term sheet, leaving room for future negotiations.

As for the land on which the stadium sits and surrounding land, Kroenke will control all ownership. In addition, the letter also makes clear all development around the stadium will be controlled by Kroenke.

The Raiders and Chargers have partnered to build their own stadium in Carson, but while momentum has been building within the NFL to support that project, there remains a stalemate among owners trying to decide which site to back and what teams or teams to approve relocation to L.A.

If the Raiders and Chargers believe they have the necessary support, obviously it makes Kroenke’s offer moot. However, if a stalemate remains, flexibility is needed to break it. That means all three teams will need to be open to negotiating an outcome.

Kroenke is showing he is at least open to being flexible, although if it goes down an Inglewood partnership path, you can expect some hard negotiations to make the deal more advantageous to both sides.