Seeking Advice: Land Deal near Poughkeepsie (Dutchess County) NY

[Daniel Whitmore]

I am having trouble determining the market value of a 4 acre vacant lot in Dutchess County NY near East Fishkill. Both the assessed value & market values indicated on the county website seem unusually high to me. Seller is motivated to sell (far below assessed value) but I'm not confident in my competitive analysis and valuation. I also obtained engineering plans I've examined but again I'm not confident in my analysis and unclear what it would cost to pave driveway, drill well etc. I can talk to Engineer about this but am primarily seeking help with valuation of vacant lot. 

Thanks in advance and please reach out if you know of anyone who might be willing to help.