Per Spectrum SportsNet's Larry Coon, the Spurs' request includes Brandon Ingram, Kyle Kuzma, Josh Hart, two first-round draft picks and swapping two more draft picks.
As the Spurs continue to weigh their options with Leonard for next season, it's been made clear to this point they don't intend to settle for anything less than what they want.
ESPN's Adrian Wojnarowski noted Leonard's desire to join the Lakers remains intact as trade negotiations continue.
Since the Lakers secured an agreement from LeBron James, they've devoted most of their remaining financial resources to one-year deals with the likes of Rajon Rondo, Kentavious Caldwell-Pope, Lance Stephenson and JaVale McGee.
Per Spotrac, the Lakers currently have $1.38 million in cap space left. If they are confident Leonard is determined to play for them, waiting to sign him next summer when he can become a free agent is an option.
Then again, Paul George seemed bound for the Lakers as a free agent this summer only to reach an agreement on an extension with the Oklahoma City Thunder as soon as free agency began Sunday, per Wojnarowski.