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A change or a series of changes that a reasonable purchaser, on an objective basis, would have regarded collectively as sufficiently important to the decision to purchase a condominium unit or proposed unit in the corporation that it is likely that the purchaser would not have entered into an agreement of purchase and sale for the unit or the proposed unit or would have exercised the right to rescind such an agreement of purchase and sale under section 73 of the Condominium Act.
Source
http://www.e-laws.gov.on.ca/html/statutes/english/elaws_statutes_98c19_e.htm#BK0