These brick rowhouses were built ca. 1840s. They are typical examples of Lancaster city residences constructed during that decade. The facades have a sawtooth cornice and transoms over the entries. An arched passageway leads to the rear.
The unit to the right (Number 21) has a mansard roof which was added later, ca. 1875. That roof renovation included the addition of gabled dormers and a modillioned cornice.
In the early 1890s the center unit (Number 19) was home to the “dental parlor” of dentist Dr. Will H. Trout. 17, 19, 21 South Prince Street, Lancaster, PA.