[1] This school is based in a historic building that was designed by Irwin T. Catharine and built between 1927 and 1928.

It is a five-story, seventeen-bay, brick building that was created in the Late Gothic Revival style.

It features a projecting end pavilions with arched openings, carved limestone decorative elements, a large stone Gothic entryway, and a large battlement tower.

[3] It was named to commemorate Penn's Treaty with the Indians.

It previously fed into Kensington High School.