This could not be done from a distance;
You should contact a local Realtor and have them do a CMA, similar to an Appraisal,
researching the Comp's and looking at the lots.
Everything would hinge on the Buyers and what they would DO with the lots:
If these are commercial lots, the value of the lot would be determined by what they used them for, what they built on them:
Visualize that a Buyer would put up a 25 unit apartment building or a 7/11; the lots would certainly have different values to the buyer.
If you are talking residential lots, the possibilities/variables would be a lot better for you.
So you have to work with this.
Good luck and may God bless