Homes in Keystone Phoenix, AZ   See all homes for sale in Keystone in Phoenix AZ.  Is it time to sell?  Find out what your home in Keystone in Phoenix AZ is worth. Why Do People Live here? Keystone is a well-preserved and extremely sought after subdivision in a perfect location of Ahwatukee. The residential area provides all the amenities including the community pools in the Mountain Park Ranch. The attractively landscaped front yard of each house is maintained by the HOA. Keystone is very near to the parks and paths for walking and biking. This charming neighborhood has a cottage feel ambiance with the tree-lined streets. Keystone is an engaging neighborhood that gets affordable and chic living easy to attain! Looking for a home in Keystone? If you are interested in the current  simila... 02/03/2015