I find it puzzling that you would go to the county (professionals) without professional representation but you free safe in asking for free advice from those who are unqualified to provide it.
Have you ever heard of the expression â€œpenny wise and pound foolishâ€?
That said, unless the difference in $ is less than $1000, I'd probably bring a lawyer along... there's a lot of money at stake, and it's probably worth the expense.
If you are thinking about a counter-offer to the County- it may or may not work. IF you have the documentation as to your reasoning- bring it with you.