446. Where the fair market value, immediately after the individual’s death, of the properties referred to in paragraph b of section 445 exceeds the debts of the individual, minus the amounts described in section 449, and the legal representative designates one property, in the return referred to in that paragraph b, that is capital property other than depreciable property or money,(a) the capital gain or capital loss, as the case may be, from the disposition that such individual is deemed to have made of that capital property under section 436 is the portion of that gain or loss represented by the proportion between the amount by which the fair market value of that capital property immediately after his death exceeds that excess, and that fair market value at the same time; and
(b) the cost of that capital property to the trust is, where the individual has a capital gain contemplated in paragraph a, the aggregate of the adjusted cost base of that capital property to him immediately before his death and the capital gain so determined or, where the individual has a capital loss contemplated in the said paragraph, the amount by which the adjusted cost base to him immediately before his death exceeds the capital loss so determined.