3. Cumulation of reductions: The initial rate of 25% and the additional rate obtained by an owner under section 2 shall be added cumulatively up to a total reduction rate for classified immovable heritage property equal to one-half of the value entered on the valuation roll of the local municipality where such property is situated.
Where such total rate for classified immovable heritage property is not equal to a reduction of one-half of the value entered on the valuation roll, an additional rate obtained by an owner for a subsequent year shall be added cumulatively to the total rate of the most recent reduction obtained, up to a total rate for a fiscal year equal to a reduction of one-half of the value entered on the valuation roll.
R.R.Q., 1981, c. B-4, r. 3, s. 3; O.C. 1378-2000, s. 3.