(a)？Acquisition of a leasehold. If a leasehold is acquired for business purposes for a specified sum, the purchaser may take as a deduction in his return an aliquot part of such sum each year, based on the number of years the lease has to run. Taxes paid by a tenant to or for a landlord for business property are additional rent and constitute a deductible item to the tenant and taxable income to the landlord, the amount of the tax being deductible by the latter. For disallowance of deduction for income taxes paid by a lessee corporation pursuant to a lease arrangement with the lessor corporation,