The most recent expansion, the Modern Wing designed by Renzo Piano, opened in 2009 and increased the museum's footprint to nearly one million square feet, making it the second-largest art museum in the United States, after the Metropolitan Museum of Art.
Den seneste tilbygning, Modern Wing tegnet af Renzo Piano, åbnede i 2009 og forøgede museets område til omkring 90.000 m², hvorved det blev det næststørste museum i USA, kun overgået af Metropolitan Museum of Art i New York.