 An owner or occupier may apply to the Commissioner of Rating and Valuation (the Commissioner) for an apportionment of the rateable value of a single tenement which comprises several tenements valued together under Section 10 and the Commissioner shall give notice of the apportionment in the specified form.This provision for apportionment may assist the ratepayers or owners in determining the respective share of rates for each of the owners or occupiers of the single tenement.The apportionment of the rateable value does not constitute a separate rating assessment made under the Rating Ordinance.