For much of Philadelphia's history, the typical home has been the row house. The row house was introduced to the United States via Philadelphia in the early 19th century and, for a time, row houses built elsewhere in the United States were known as "Philadelphia rows". A variety of row houses are found throughout the city, from Victorian-style homes in North Philadelphia to twin row houses in West Philadelphia. While newer homes are scattered throughout the city, much of the housing is from the early 20th century or older. The great age of the homes has created numerous problems, including blight and vacant lots in many parts of the city, while other neighborhoods such as Society Hill, which has the largest concentration of 18th-century architecture in the United States, have been rehabilitated and gentrified. COUNT 5
QSN1 What is the dominant type of house in Philadelphia? ANS1 row house QSN2 What are row houses called outside of Philadelphia? ANS2 Philadelphia rows QSN3 How old is most of the housing in Philadelphia? ANS3 early 20th century or older QSN4 Name a type of row house in the city? ANS4 Victorian-style homes in North Philadelphia to twin row houses in West Philadelphia QSN5 Which neighborhood has the oldest housing in America? ANS5 Society Hill