Russell Westbrook‘s contract extension with the Oklahoma City Thunder is the most lucrative in the history of the NBA.

With the new deal, Oklahoma City has $138 million in guaranteed contracts for next season if both Paul George and Carmelo Anthony opt into their deals. The salary cap is projected to be $101 million for the 2018-19 season, with a projected luxury tax number of around $125 million.

The team will pay significant luxury tax penalties as potential repeat offenders. But the front office is reportedly committed to fronting a massive luxury tax bill, which means they won’t be afraid to retain both George and Anthony.

As such, the Thunder could become the first NBA team in history to spend $300 million on combined salary and luxury tax.

Westbrook is now locked in for the next five seasons. Now, Presti will shift his focus to persuading George and Anthony to stay long-term as well. But that might just happen.