Billionaire investor Charles T. Munger, who’s been Warren Buffett’s right-hand man at Berkshire Hathaway for more than five decades, has made a gift of stock worth $40 million to the Henry E. Huntington Library and Art Museum in San Marino, California, the Associated Press reports.

Munger gave 77 Class A Berkshire Hathaway shares valued at more than $40.3 million to the Huntington, according to a filing with the Securities and Exchange Commission. A decade ago, he gave the institution nearly $33 million worth of Berkshire stock to help pay for a new education and visitors center.

Huntington spokesperson Susan Turner-Lowe told the AP that the latest donation will be used to build more than 30 residences for visiting scholars to use while they spend time at the museum conducting research.

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