This ordinance, relating to land use and zoning, expands housing options by easing barriers to the construction and use of accessory dwelling units (ADUs) as required by state legislation, specifically House Bill 1337. It amends various sections of the Seattle Municipal Code (SMC) and adds new sections (23.42.022 and 23.53.003) to comply with state mandates, promoting housing capacity and affordability. Key changes include allowing up to two ADUs per lot with a principal dwelling unit (including two detached ADUs), updating standards for height limits, parking, and street improvements, and clarifying provisions for condo ownership of ADUs. The legislation aims to mitigate displacement and provide varying housing options throughout the city. It also updates rules for terminating tenancy related to ADUs and modifies regulations for unit lot subdivisions, floor area exemptions, yard requirements, and the conversion of existing structures to ADUs.