When plans for construction or modification of a county care facility have been properly approved by the Iowa department of public health or other appropriate state agency, the facility constructed in accord with the plans so approved shall not for a period of at least ten years from completion of the construction or modification be considered deficient or ineligible for licensing by reason of failure to meet any regulation or standard established subsequent to approval of the construction and modification plans, unless a clear and present danger exists that would adversely affect the residents of the facility.