The maximum total cost of the energy conservation measures required by this chapter to be installed upon sale of a commercial building is the lesser of one percent of the consideration given for the property, or one percent of the assessed value prior to sale, or one hundred fifty thousand dollars. Upon subsequent sales of such building, any remaining energy conservation measures shall be installed subject to the expenditure limit provided in this section for each such sale. (Ord. 6176-NS § 5, 1993)