Last week, I was proud to co-host the Home for All Second Units Convening alongside my Home for All Co-Chair, Supervisor Don Horsley. It was a packed house for the event, called “Second Units: What, Why, and How.” We heard from experts on Accessory Dwelling Units, or ADUs, which are small structures that typically range from 220 to 1,000 square feet and are built on the property of existing homeowners, either as a stand-alone or inside or attached to a house.