It was added to the National Register of Historic Places in 1983.

[1] Designed by noted Lancaster architect C. Emlen Urban and built between 1904 and 1905, this historic structure is a three-story, rectangular brick and brownstone building that was created in the Second Renaissance Revival style.

It has a slate covered mansard roof and terra cotta ornamentation.

The school is named for Congressman Thaddeus Stevens (1792–1868).

[2] It was converted to apartments in the 1980s by developer Owen Kugel.