In 2010, during the economic slump, when many building plans were being shelved, Portland presciently began to allow homeowners the right to develop accessory dwelling units on standard 5,000-square-foot residential lots for the first time. The city also eliminated development charges of up to $15,000 for new accessory dwelling units to spur homeowners to build. This Garden House won top design award from the American Institute of Architect. More info at the link.