1982 National Register of Historic Places Inventory for Colonial Germantown Historic District:
"(SEC Pastorius) Residential building, 1871, two and one-half stories, stone with wood trim, Second Empire style. --- Contributing."

Background:
Samuel Keyser's heirs held the property until it was sold in 1870 to Washington Pastorius, who tore down the old buildings, erected two houses on Germantown Avenue and opened up Pastorius Street.

Additional Sources:

• HSP: Campbell Collection, vol. 33, pp. 205-209: Mennonite Church (various sketches, printed and photographic images of the Mennonite Church over time. Neighboring buildings include first the Keyser House and then a Victorian house to the left as well as different buildings behind the Meeting House. Includes images by artist John Richards and photographer L. Sowden).