Rent
4.  For the purposes of Part 12 of the Act, “rent” (as defined in section 86 of the Act), payable by a tenant to a landlord for a property —
(a)includes —
(i)any amount payable by the tenant to the landlord that is determined by the gross turnover of any business carried on by the tenant at the property or part of the property; and
(ii)any amount payable by the tenant to the landlord as property tax for the property; but
(b)where the property (called in this paragraph the subject property) is part of a larger property (called in this paragraph the main property) that is leased or licensed to the tenant by the landlord, excludes —
(i)such part of the rent for the main property that is not attributable to the subject property, as agreed between the tenant and the landlord; or
(ii)in the absence of such agreement, an amount calculated using the formula where —
(A)A is the total gross floor area of the main property;
(B)B is the total gross floor area of the subject property; and
(C)C is the rent payable by the tenant to the landlord for leasing or licensing the main property.