244.64. For the purposes of sections 244.59 to 244.63 and the by-law provided for therein, in the case of a non-taxable unit of assessment in respect of which an amount in lieu of the tax must be paid by the Government pursuant to the second paragraph of section 210 or the first paragraph of sections 254 and 255 or by the Crown in right of Canada or by one of its mandataries, the word “tax” means the amount in lieu thereof.