Downtown Harrisburg is the central core neighborhood, business and government center which surrounds the focal point of Market Square, and serves as the regional center for the greater metropolitan area of Harrisburg, Pennsylvania, United States. Harrisburg's downtown Center City comprises the original 80-acre (320,000 m2) borough laid out in a grid pattern by John Harris in 1785. East–west streets are named and north–south streets are numbered. Market Street, running east–west, is the dividing point between north and south street designations.