(1) In this section -

'agricultural property' has the meaning assigned to it by section 89;

'current use value' -

(a) in relation to land at any particular time, means the amount which would be the market value of the land at that time if the market value were calculated on the assumption that it was at that time and would remain unlawful to carry out any development (within the meaning of section 3 of the Planning and Development Act 2000) in relation to the land other than development of a minor nature, and

(b) in relation to shares in a company at any particular time, means the amount which would be the value of the shares at that time if the market value were calculated on the same assumption, in relation to the land from which the shares derive all or part of their value, as is mentioned in paragraph (a);

'development land' means land in the State, the market value of which at the date of a gift or inheritance exceeds the current use value of that land at that date, and includes shares deriving their value in whole or in part from such land;