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(b) which had been developed by or for the company to such an extent that it could reasonably be expected at that time that no further development (within the meaning of section 639) of the land would be carried out in the period of 20 years beginning at that time (other than a development which is not material and which is intended to facilitate the occupation of, and the use or enjoyment of, the building or structure for the purposes for which it was constructed) and for those purposes a development of land on which a building or buildings had been constructed shall not be material if it consists of one or both of the following—

(i) carrying on a business that includes the erection of buildings or the development of land (within the meaning of section 639(1)) or the manufacture, treatment or extraction of materials for use, whether used or not, in construction operations,

(i) carrying on a business which includes the erection of buildings or the development of land (within the meaning of section 639(1)) or the manufacture, treatment or extraction of materials for use, whether used or not, in construction operations,