(1) In this section -
"conversion expenditure" means, subject to subsection (2), expenditure incurred on - (a) the conversion into a house of a building in the Custom House Docks Area which has not been previously in use as a dwelling, and (b) the conversion into 2 or more houses of a building in the Custom House Docks Area which before the conversion had not been in use as a dwelling or had been in use as a single dwelling,
and references in this section and in section 329 to "conversion", "conversion into a house" and "expenditure incurred on conversion" shall be construed accordingly;
"qualifying lease", in relation to a house, means, subject to section 329(2), a lease of the house the consideration for the grant of which consists - (a) solely of periodic payments all of which are or are to be treated as rent for the purposes of Chapter 8 of Part 4, or (b) of payments of the kind mentioned in paragraph (a), together with a payment by means of a premium which does no