WASHINGTON (AP) — The National Gallery of Art plans to close its modern art galleries for three years to complete a $68 million renovation, adding new galleries and a rooftop sculpture garden.

Federal funds will pay for renovations to the East Building’s infrastructure, totaling $38.4 million. Private donors are contributing $30 million to create 12,260 feet of new exhibition space and a sculpture garden overlooking Pennsylvania Avenue.

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The museum said Wednesday that National Gallery President Victoria Sant and her husband, Roger, are contributing $10 million, along with board member Mitchell Rales and his wife, Emily, and David Rubenstein of the Carlyle Group.

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Galleries will close between July and December, with construction set to begin in January.

New galleries in two towers may highlight Mark Rothko and other works from the museum’s collection.

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