Addressed to "San Antonio", Leonard thanked the Spurs' organization, coaching staff, teammates, and fans for their support during his seven years with the franchise.
Leonard also thanked his former teammates, Gregg Popovich and Spurs fans in the letter, and said he'll "never forget what we have shared and accomplished together".
Leonard has one year and a player option left on his current deal and is set to make $20.1 million in 2018-19.
"THANK YOU Pop I'll always be grateful for my growth under your guidance", Leonard wrote.
THANK YOU to the fans! "I'll always remember the city and the people of San Antonio!".
Koreas prepare for summit as North Korea asks US to ease sanctions
The dismantlement has been made as a follow-up to North Korean leader Kim Jong Un's pledge at the June 12 summit with U.S. The United States is "not willing to wait for too long" for North Korea to take steps toward denuclearization, U.S.
"Through all the ups and downs - I'm glad there were many more ups!"
Just days after longtime Spur Tony Parker wrote a goodbye letter to San Antonio and the Spurs family, ex-Spur Kawhi Leonard has done the same.
While Leonard rarely speaks publicly on his intentions, the belief among most pundits is that he wants to join the Los Angeles Lakers.
Leonard, if healthy, would give Toronto one of the best two-way players in the National Basketball Association and a true bonafide superstar. He was the Finals MVP in 2014 when the Spurs beat the Miami Heat in five games for the title.
While last season was one to forget for Leonard, his time in San Antonio will be better defined by his 2013-14 campaign, when he helped the Spurs capture their fifth National Basketball Association title while being named MVP of the Finals.