Calling it an "extraordinary" gift and the largest in the school's history, the president of Gustavus Adolphus College in St. Peter, Minn., said the institution received a $25 million donation from a Twin Cities family.
The money will help pay for a planned $65 million redo of the school's 52-year-old Alfred Nobel Hall of Science.
"It is wonderful news for us," said Gustavus President Rebecca Bergman.
The school hopes to break ground on the renovation and expansion project in a year to 18 months, she said. Bergman said it's unclear for now if Gustavus will pay for the new science hall without taking on additional debt.
The donors behind the $25 million gift wished to remain anonymous, but their family includes five Gustavus graduates, said Tim Kennedy, a spokesman for Gustavus.
Their gift is among the largest ever to a Minnesota school, and one of the largest in the past few years. University of St. Thomas landed a $60 million gift in 2007 and a $50 million gift the following year.
The donation comes as the school wraps up a $150 million fundraising campaign begun four years ago. The Carl and Aune Lind Family Foundation gave $3 million to Gustavus earlier this year.
Gustavus chemistry professor Scott Bur said the school's science hall was built amid the Sputnik-era push for science and technology. Decades on, the building needs renovations to fit modern equipment and up-to-date teaching methods.