A 40-acre, off-the-grid property in Maricopa County can be yours - for a price Unique piece of land up for grabs near the Valley This off-the-grid property, dubbed the Last Outpost, could be your chance to rise above the ruckus, and simply get away from it all. PHOENIX - Want to get away from it all? There’s a unique piece of land for sale in the North Valley that will let you rise above the ruckus. The property, called "The Last Outpost," is being marketed as an off-the-grid property. Beyond double locked gates and up a daunting driveway is the top of Continental Mountain, located in an unincorporated portion of Maricopa County, in an area wedged between Cave Creek and the Tonto National Forest.