The neoclassical building, which was rebuilt many times during the 20th century, was supplemented by a new wing with 53 rooms for the exhibition of American art, and the existing courtyard was glazed. At the same time, a new southern entrance was created, as well as the northern, which had not been used for a long time. Thus, the strict symmetry originally laid down in the plan of the complex (1907) was restored.
All new designs are dominated by glass, which allows extensive use of natural light; at the same time, a system of openwork screens protects the exhibits from the sun.
The glassed-in courtyard accommodates the information center and cafe, provides more convenient access to different parts of the museum; below it is a new underground hall for temporary exhibitions.
During the reconstruction, which also includes the almost complete renovation of all parts of the museum complex, a new landscape design was created for the area immediately adjacent to the museum. This plan is in harmony with the nearby historic park area created in the 19th century. the outstanding landscape architect F. L. Olmsted.
