SANTA CLARA, Calif. — The 49ers early Wednesday morning made big news along the offensive line, making a pair of notable signings.

First, they agreed to terms on a record-setting contract with free agent Trent Williams, who will sign a six-year deal worth up $138.06 million, making him far and away the highest-paid offensive lineman in NFL history.

San Francisco wasn’t done. The 49ers addressed their glaring need at center by agreeing to terms with Atlanta Falcons free agent Alex Mack, according to a report from NFL Network. The Cal alum was named to the All-Decade team for the 2010s and has appeared in six Pro Bowls.

The 35-year-old reunites with Kyle Shanahan, with whom he played for previously in Cleveland and Atlanta in 2014 and 2016, respectively. Shanahan helped bring Mack from Cleveland to Atlanta in free agency and he helped the team reach the Super Bowl.

It all but confirms incumbent center Weston Richburg is likely done with the 49ers. Richburg recently had hip surgery, his third procedure since he last played in Dec. 2019 when he tore the patellar tendon in his knee.

It was believed the Kansas City Chiefs were making a strong push to sign Williams after releasing their two starting tackles over the last week. The belief is the 49ers had to increase their offer to account for California’s more burdensome 13% income tax against Missouri’s 5.4%. The Chicago Bears were also reportedly in the mix after agreeing to sign Andy Dalton to a $10 million deal to compete for the starting quarterback job.

Williams’ contract, if fully realized, far surpasses the other contracts for the league’s top tackles. Ravens star Ronnie Stanley signed a four-year, $97.75 million contract in October, while the Packers gave David Bakhtiari a four-year, $92 million deal in November. Those deals average $19.75 million and $23 million per year, respectively. Williams’ deal averages $23.01 million per season.

The 49ers had been working to get Williams re-signed for months leading into the start of free agency, but the eight-time Pro Bowler was steadfast in wanting to see his value on the open market. After all, elite left tackles in their primes rarely hit unrestricted free agency, and the two sides agreed to a clause in his contract last offseason that prevented San Francisco from giving Williams the franchise tag this spring, which would have kept him under contract for $13.8 million fully guaranteed.

Yet even dating to last season, Williams said returning to the 49ers was his No. 1 choice. He built a strong relationship with Shanahan and offensive line coach Chris Foerster dating to his time with Washington. Shanahan was the offensive coordinator when Washington made him the fourth overall pick in 2010.

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