Mass. Gen. Laws ch. 44B, § 10
(f) After determining the community preservation rank for each city and town, the commissioner shall divide all cities or towns into deciles according to their community preservation ranking, with approximately the same number of cities and towns in each decile, and the cities or towns with the highest community preservation rank shall be placed in the lowest decile category, starting with decile 10. Percentages shall be assigned to each decile as follows:
decile 1 140 per cent of the base figure
decile 2 130 per cent of the base figure
decile 3 120 per cent of the base figure
decile 4 110 per cent of the base figure
decile 5 100 per cent of the base figure
decile 6 90 per cent of the base figure
decile 7 80 per cent of the base figure
decile 8 70 per cent of the base figure
decile 9 60 per cent of the base figure
decile 10 50 per cent of the base figure
After assigning each city and town to a decile according to their community preservation rank, the commissioner shall multiply the percentage assigned to that decile by the base figure to determine the second round equity distribution for each participant.
(i) The commissioner shall determine each participant's total state grant by adding the amount received in the first round distribution with the amounts received in any later round of distributions, with the exception of a city or town that has already received a grant equal to 100 per cent of the amount the community raised by its surcharge on its real property levy.