The concession or incentive would have a specific adverse impact upon public health, safety, or the physical environment, or on any real property listed in the California Register of Historical Resources, and there is no feasible method to satisfactorily mitigate or avoid the specific adverse impact without rendering the development unaffordable to extremely low-, very low-, low-, or moderate-income households. For purposes of this subsection, "specific adverse impact" means a significant, quantifiable, direct, and unavoidable impact, based on objective, identified, written public health or safety standards, policies, or conditions as they existed on the date that the application was deemed complete.