Development fees shall be imposed and collected when an existing structure is demolished and replaced. The development fee of 2.5% shall be calculated on the difference between the equalized assessed value of the preexisting land and improvement and the equalized assessed value of the newly improved structure, i.e., land and improvement, at the time a final certificate of occupancy is issued. If the calculation required under this section results in a negative number, the nonresidential development fee shall be zero.