The older neighborhoods of the early 20th century, such as West Central, East Central, Logan, Hillyard, and much of the lower South Hill, feature a large concentration of American Craftsman style bungalows. In Hillyard, the most architecturally intact neighborhood in Spokane, 85 percent of these buildings are historic. As the city expanded mainly to the north in the middle of the 20th century, the bungalows in the "minimal traditional" style commonplace from the 1930s to the 1950s tend to predominate in the Northwest, North Hill, and Bemiss neighborhoods. This architectural style occupies the neighborhoods where the integrity of Spokane's street grid pattern is largely intact (especially the areas north of downtown and south of Francis Ave.), and the houses have backyard alleys for carports, deliveries, and refuse collection. Contemporary suburbs and architecture are prevalent at the north and south edges of Spokane as well as in the new Kendall Yards neighborhood north of downtown.