Arizona is the birthplace of modern active retirement communities. In the s, Del Webb introduced Sun City - the first age-restricted active adult community in the country. Since then, the concept of self-contained active adult communities has flourished. There are now in excess of , homes in plus age-restricted communities in Arizona. The newest Pulte Active Adult Living Community is Lone Tree. Located in Chandler, the small community of only 72 homes, is adjacent to the older Pulte communities of Solera and Springfield .