This Norman Revival building was originally designed by James Renwick, Jr. after a nationwide design competition in 1846. Though officially named the Smithsonian Institution Building, it is more commonly referred to as the Castle. The site was designated a National Historic Landmark in 1965 and listed on the National Register of Historic Places in 1966. Today, the building serves as a visitor information center and institution headquarters.
Silman’s past work at the Castle has included interior renovations, exterior assessments, seismic condition assessments, perimeter security, and blast protection upgrades.