(1) In this section, "qualifying premises" means a building or structure the site of which is wholly within the Custom House Docks Area and which -
(a) apart from this section is not an industrial building or structure within the meaning of section 268(1), and
(i) is in use for the purposes of a trade or profession, or
(ii) whether or not it is so used, is let on bona fide commercial terms for such consideration as might be expected to be paid in a letting of the building or structure negotiated on an arm's length basis,
but does not include any building or structure in use as or as part of a dwelling house.
(a) Subject to subsections (3) to (5), the provisions of the Tax Acts relating to the making of allowances or charges in respect of capital expenditure incurred on the construction of an industrial building or structure shall, notwithstanding anything to the contrary in those provisions, apply -
(i) as if a qualifying premises were, at all times at which it is a qualifying
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