Can I convert my garage to a backyard cottage (DADU)?

For a single family lot in a single family zone in Seattle an existing detached accessory structure may be converted to an accessory dwelling unit (DADU) if it meets certain requirements outlined in the Seattle Municipal Code. One of these requirements is meeting minimum side and rear yard setbacks 5 ft (DADUs are not allowed in required front setbacks). Most detached garages are built on or within 5 ft of the side property line. At the discretion of the director  these to be converted to backyard cottages if the accessory structure was constructed legally prior to June 1, 1999 and the conversion does not increase its non-conformity.