Change of Use. A building or structure nonconforming by parking, may be changed to a different use, pursuant to all other provisions of this chapter, provided that such new use meets the following parking requirements. The number of additional parking spaces required shall be the difference between the number of spaces required for the proposed use and the number of spaces required for the previous use. In the event that the new use requires less parking spaces than the previous use, no additional parking spaces need be supplied. However, none of the existing parking spaces shall be eliminated unless the total number of spaces required by this chapter for the new use are provided.