DENVER (CBS4) – The Denver Art Museum is making plans to spend its largest donation ever.

(credit: CBS)

(credit: CBS)

Board chairman J. Landis Martin and his wife Sharon have pledged $25 million.

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The museum will use the donation to renovate the north building.

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(credit: CBS)

(credit: CBS)

It’s the only completed building in North America designed by renowned Italian modernist architect Gio Ponti.

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The plan is to spruce up the building in time for the 50th anniversary in 2021.