Silman also provided structural support for gallery, exhibit, and retail displays. The mansion is now dedicated to functions such as exhibitions, art handling, retail, and food service, while the adjacent townhouses contains offices, education spaces, and the relocated National Design Library.
For over two decades, Silman has worked on various portions of this former Carnegie mansion, designed by Babb, Cook, and Willard in 1902. The museum is listed on the National Register of Historic Places.
This particular renovation project included gallery and infrastructure improvements within the mansion and townhouses, new elevators, and art conservation labs. The main stair and cafe were renovated and expanded, and a new canopy was added at the 90th Street entrance. Structural work included modifications to the superstructure and foundation of the mansion and townhouses to accommodate the updated program.