John & James Dobson Carpet Mill (West Parcel), Building No. 18, 4041-4055 Ridge Avenue, Philadelphia, Philadelphia County, PA

Significance: Building 18 was built in 1919, the first and only mill building to use nationally known architects to depart significantly from the construction techniques established in the earlier structures. Even with this departure, the architects chose to maintain the architectural vocabulary of the complex using the same materials found throughout the site, rubble walls with brick trim. Building 18 is the last building built within the period of the Dobsons' ownership.
Survey number: HABS PA-5383-Q
Building/structure dates: 1919 Initial Construction
Building/structure dates: 1962 Subsequent Work