Historical Sites and Preservation - As enacted, clarifies that renovations of memorials are excluded from the petition for waiver process under the Tennessee Heritage Protection Act of 2016; excludes from coverage under the act buildings and structures that have reached the end of their useful lives and are approved for demolition by the state building commission; requires that prior to any decision to demolish a memorial designated as a national historic landmark or listed on the register of historic places, the historical commission make comments to the state building commission. - Amends TCA Section 4-1-412.