Raising/hardening structures: Other options, especially for buildings further back but still at risk from storm surge, may be raising the structure and hardening against storm surges. Some architectural designs allow waves to flow under the main level of a home and keep the living space above likely storm surge levels. Many of the more robust designs are feasible for new homes but are difficult to retrofit into existing homes. For new or replacement development, there may be an opportunity depending on lot size to build at a greater setback or entirely outside the risk zone. Maintain-in-place may be feasible for many structures and areas, but such actions should include mitigation of environmental impacts. Mitigation could be provided either through specific projects to assist adaptation to sea level rise on site or in nearby areas, or for small individual actions by allowing an in-lieu fee to go towards such projects. The latter is already Swinomish Climate Change Initiative Climate Adaptation Action Plan allowed in some circumstances under the SSA ordinance via a shoreline mitigation and restoration fund.