 Philadelphia architect Addison Hutton designed an expanded facility that included a three-story warden's house and guardhouse control center in a “T” shape, using a combination of Italianate and Romanesque Revival styles.The architecture was inspired by Quaker ideas of reflection and penitence that dominated the American prison system in the 19th century.The overall design concept of the prison was modeled after the Eastern State Penitentiary in Philadelphia, built in 1829.