John Gill Commentary Leviticus 25:16

"According to the multitude of the years thou shalt increase the price thereof, and according to the fewness of the years thou shalt diminish the price of it; for the number of the crops doth he sell unto thee." — Leviticus 25:16 (ASV)

According to the multitude of years you shall increase the
price of it
More was to be asked and required, and should be given for an estate, when, for instance, there were thirty years to the year of jubilee, than when there were but twenty;

and according to the fewness of years you shall diminish the price of
it ;
if it wanted but five, or six, or ten years unto it, then, in proportion, less was to be insisted upon and given:

for [according] to the number [of the years] of the fruits he sells
to you ;
which also must be considered, how many years of tillage of land, and cultivation of vineyards there were in the account, and how many sabbatical years to be deducted; for only according to the number of fruit years was the estate to be valued and sold.