 Walnut Hill was largely built from the start of the 20th century through the 1940s, with a large growth spurt immediately following the construction of what is now the SEPTA Market-Frankford Line.The primarily residential neighborhood consists of 2 and 3-story rowhomes, with several pre-war garden style apartments.West Philadelphia High School is located in Walnut Hill and The Restaurant School at Walnut Hill College is close by, if not technically within the boundaries of the neighborhood.