Room 307 was where Glenn T. Seaborg and his coworkers identified plutonium[2][3] as a new element on February 23, 1941 and as such, is designated a National Historic Landmark.

Gilman Hall was built from 1916 to 1917 to accommodate an expanded College of Chemistry under the leadership of Gilbert N. Lewis.

Designed by John Galen Howard, the building provided research and teaching facilities for faculty and students specializing in physical, inorganic and nuclear chemistry.

Gilman Hall has been used continuously by the College of Chemistry for 80 years; today it is occupied by the Department of Chemical and Biomolecular Engineering.

Following the FUSRAP remediation work, Gillman Hall has been certified as safe to current radiologic standards.