Section 344 of the Principal Act is hereby amended in subsection (1) by the substitution of the following for the definition of "qualifying period":
"'qualifying period' means the period commencing on the 1st day of July, 1995, and ending on -
(a) the 30th day of June, 1998, or
(b) the 30th day of June, 1999, where, in relation to the construction or refurbishment of the qualifying multi-storey car park concerned, the relevant local authority gives a certificate in writing on or before the 30th day of September, 1998, to the person constructing or refurbishing the qualifying multi-storey car park stating that it is satisfied that not less than 15 per cent of the total cost of the qualifying multi-storey car park and the site thereof had been incurred prior to the 1st day of July, 1998, and, in considering whether to give such a certificate, the relevant local authority shall have regard only to guidelines in relation to the giving of such certificates issued by the Department of the En
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