Built in 1884 from Pennsylvania sandstone, Chandler-Ullmann Hall won a design prize at the Paris Exposition of 1889. Considered the first modern chemical laboratory, the building boasted large labs and chimneys that aided in the circulation of fresh air and the removal of fumes from experiments. In 1994, the lab section was designated a National Historical Chemical Landmark.

The force behind the original T-shaped structure was William H. Chandler, professor of chemistry from 1871 to 1905 and twice an acting Lehigh president. With architect Addison Hutton, Chandler helped plan the building.

In 1921, the west wing was extended, and in 1938, an east wing, named for Harry M. Ullmann, was added. Ullmann chaired the chemistry department from 1914 until 1938.

The lab was the chemistry department’s main building until 1975, when the Seeley G. Mudd Laboratory was completed. The department of psychology and the department of art, architecture and design are now housed there.