Communications Hill is a 500-acre tract of steep hillside terrain near downtown San Jose, surrounded by commercial strips, auto-dominated low-density residential neighborhoods, and arterial highways. As planned and largely executed, Communications Hill is a high-density urban neighborhood, congenial for walking, unlike anything built in Silicon Valley during the previous 30 years of explosive growth. The plan superimposes a tight grid of streets and blocks over the steep terrain, in a manner similar to San Francisco or Seattle. Certain street corridors that are too steep for cars are pedestrian ways with public stairs and gardens. The block pattern incorporates neighborhood parks and a retail center. The residential buildings (designed by others) range from row houses to stacked flats with future proposals for high-rise towers in strategic locations. As of 2015, approximately 2,800 units of the 4,400 unit neighborhood have been built.