In March 1958, the first addition to the building opened, doubling the museum's floorspace.
This addition, which was on the north side of the original building, was designed by the Cleveland architectural firm of Hayes and Ruth.
They designed new gallery space and a new art library.

The museum again expanded in 1971 with the opening of the North Wing.
With its stepped, two-toned granite facade, the addition designed by modernist architect Marcel Breuer provided angular lines in distinct contrast with the flourishes of the 1916 building's neoclassical facade.
The museum's main entrance was shifted to the North Wing.
The auditorium, classrooms, and lecture halls were also moved into the North Wing, allowing their spaces in the Original Building to be renovated as gallery space.

In 1983, a West Wing, designed by the Cleveland architectural firm of Dalton, van Dijk, Johnson, & Partners, was completed.
This provided larger library space, as well as nine new galleries.

Between 2001 and 2012, the 1958 and 1983 additions were demolished.
A new wrap-around building, and east and west wings were constructed.
Designed by Rafael Viñoly, this $350 million project doubled the museum's size to 592,000 square feet (55,000 m²).
To integrate the new east and west wings with the Breuer building to the north, a new structure was built along the south side of the 1971 addition, creating extensive new gallery space on two levels, as well as providing for a museum store and other amenities.
Viñoly covered the space created by the demolition of the 1958 and 1983 structures with a glass-roofed atrium.
The east wing opened in 2009, and the north wing and atrium in 2012.
The West Wing opened on January 2, 2014.
In March 1958, the first addition to the building opened, doubling the museum's floorspace. This addition, which was on the north side of the original building, was designed by the Cleveland architectural firm of Hayes and Ruth. They designed new gallery space and a new art library.
The museum again expanded in 1971 with the opening of the North Wing. With its stepped, two-toned granite facade, the addition designed by modernist architect Marcel Breuer provided angular lines in distinct contrast with the flourishes of the 1916 building's neoclassical facade. The museum's main entrance was shifted to the North Wing. The auditorium, classrooms, and lecture halls were also moved into the North Wing, allowing their spaces in the Original Building to be renovated as gallery space.
In 1983, a West Wing, designed by the Cleveland architectural firm of Dalton, van Dijk, Johnson, & Partners, was completed. This provided larger library space, as well as nine new galleries.
Between 2001 and 2012, the 1958 and 1983 additions were demolished. A new wrap-around building, and east and west wings were constructed. Designed by Rafael Viñoly, this $350 million project doubled the museum's size to 592,000 square feet (55,000 m²). To integrate the new east and west wings with the Breuer building to the north, a new structure was built along the south side of the 1971 addition, creating extensive new gallery space on two levels, as well as providing for a museum store and other amenities. Viñoly covered the space created by the demolition of the 1958 and 1983 structures with a glass-roofed atrium. The east wing opened in 2009, and the north wing and atrium in 2012. The West Wing opened on January 2, 2014.
Cleveland Museum of Art