That benefited property owned by the municipality, a county, the State of Tennessee, or the United States Government or its agencies (if Federal law makes such property subject to assessment) shall be subject to improvement assessments, the same as private property, and the amount of each annual improvement assessment shall be paid by the municipality, county, State of Tennessee, or United States Government, as the case may be. In the case of the State of Tennessee, the amount of improvement assessment shall be certified by the municipality to the Commissioner of Finance who shall direct the State Treasurer to pay the same to the municipality out of an appropriate appropriation or from any money in the State Treasury not otherwise appropriated. No benefited property shall be exempt from improvement assessments. Improvement assessments against such public property shall be enforceable by writ of mandamus or other appropriate remedy. [As added by Priv. Acts 1970, ch. 276, § 11]