So, I think they have made a conscious decision to ignore me, ignore the vehicle issue, and see what they can get away with.  

Most are obvious why they haven't sold (steep slop, water/environmental issues, power lines) but occasionally I find one that would work with these new assumptions.

Greetings, I am a full time employed environmental consultant in NC.  

Most liens are removed after a foreclosure property sale, but certain liens may remain.Here are some examples:Any lien recorded on title prior in time to the foreclosing mortgage.First Mortgage (if the foreclosing mortgage is a second or third mortgage)HOA or COA assessment liens (in certain states)Mechanic’s Liens (in some states)Government liens such as state and federal tax liens, city or county liens, US Government liens.IRS liens (IRS may buy the property within 120 days after sale at the price paid at foreclosure sale)Code Enforcement Liens, Environmental Liens, and Utility LiensChild Support Liens"Listing agent, seller's lawyer, and their title company have all told me it's clear, but I'm just doing my due diligence because this liens exceptions list is provided by auction.com.

Subdividing raw land is not for the inexperienced, you will need to know about subdivision laws, wells if applicable, perk tests if applicable, utility installation, zoning, deed restrictions, flood zones, phase 1/2 environmental tests, legal access, and I'm probably forgetting a couple. 

Show up on opening day to collect your deed.Oh right... first do a title search to make sure there isn't $500k owing and somehow find out if there's an environmental issue. 

We certainly don't mind paying good money for a good product but still have to be somewhat price conscious as we are already pouring money into the company.  

I have bought some good deals at resale, but you need to be extra vigilant with your due diligence, sometimes there IS a reason that nobody bought the property the first go round (no road access, environmental issues, etc).  

You may also require a Phase One Environmental Assessment (EA) {which is predominately a paper exercise} depending on the requirements of your lender or the jurisdiction.I would reach out to @James Wise to learn more about the neighbourhood to see if it is a place you want to be.  

Check your state/local laws for disturbing interior/exterior surfaces/containment/abatement/environmental (particularly if it will ever be a rental).