An ADU is a great long-term investment that makes use of your existing property to create additional living space, but it can also be used as an income property when that use is appropriate. Later, you may find that you want to downsize into the ADU to minimize your upkeep, or travel... some homeowners share the main home with their family or rent it out when they want to retire and travel to visit their Grand Babies. The versatility of the ADU is as wide open as your imagination.