Regional Planning, UMass Amherst, MA 01003, USA; darrel@larp.umass.edu; Tel.: +1-413-545-6619 Received: 16 July 2018; Accepted: 5 September 2018; Published: 18 September 2018 Abstract: In 2003, California allowed cities to count accessory dwelling units (ADU) towards low-income housing ...