Brown and Gloshon met with Celtics management and ownership Sunday night in Boston, finalizing the remaining elements of the historic deal that preserves a two-time All-Star contract through the 2028-29 season.

The Browns’ deal surpassed two-time MVP Nikola Jokic’s $276 million extension with the Denver Nuggets, an increase based on salary cap increases and league revenue. Brown, 26, got a hold on Monday in Boston to solidify the deal.

Brown became eligible for a five-year SuperMax extension with the Celtics after earning All-NBA Team honors in 2022-23. Brown and teammate Jason Tatum, who is eligible for a SuperMax extension next summer, form one of the most productive duos in the NBA and are the cornerstone of the Celtics’ championship contender.

Brown averaged career bests of 26.6 points and 49% shooting last season. He will make $31.8 million next season in the final year of his previous deal.

The Browns are set to make $52.3 million when the contract starts during the 2024-25 season and $69.1 million in 2028-29, the final year of the deal. He does not qualify for a no-trade clause because he signed an extension.

Tatum and Brown combined for 56.7 points per game last season, the fourth most of the duo since the 1976-77 merger, according to ESPN Stats & Information research. They also both scored 30 points in 10 games, a feat that only Shaquille O’Neal and Kobe Bryant have achieved in the past 30 seasons. Brown led as a shot creator last season with 54% of his shots made without assists — a career-high 1.15 points per direct drive, according to Second Spectrum.

The Celtics have made the playoffs in each of their seven NBA seasons, including the NBA Finals in 2022 and three Finals trips to the Eastern Conference. Boston drafted the former UC-Berkeley star with the third overall pick in 2016.

Off the field, Brown is an entrepreneur, fashionista, and mentor to countless children, in addition to being a philanthropist in Boston and internationally. He is currently the Vice President of the National Basketball Players Association.

The Atlanta native recently attended Paris Fashion Week and spoke at Variety’s Sports and Entertainment Summit about success off the field. He has created bridging partnerships to enable youth of color to access equal education and leadership opportunities through his 7uice Foundation.

Brown is currently hosting the third annual Bridge Program in Boston for 100 Boston Public Schools students. He also plans to go to Kenya this season to speak with and mentor over 200 local students. Brown was also among 20 NBA players who took part in the NBPA’s “The Sanctuary,” a performance retreat for players hosted in Andalusia, Spain.

ESPN’s Adrian Wojnarowski and Bobby Marks contributed to this report.