Cities that have implemented a housing action plan pursuant to RCW
36.70A.600, or will have completed a housing action plan by December 31, 2023, shall be exempt from this act upon demonstrating a commitment to requiring the location of missing middle housing types in a majority of zones in accordance with meeting growth requirements specified in countywide planning policies and regional growth strategies. Cities choosing to utilize the option of implementing a housing action plan to recommend missing middle housing types and zoning shall complete and submit a report and documentation details to the department by December 31, 2023."