Find out from your lender if the underwriter will allow purchase of property with environmental hazards.

I consider following two links to be a good source for REI education:https://www.biggerpockets.com/forums/311/topics/227602-difficulty-selling-rental-properties-at-loan-amounthttp://www.indystar.com/story/news/courts/2016/05/23/environmental-court-issues-jail-order-for-california-owner-of-blighted-memphis-properties/90544714/Good Luck InvestingVivek

The poison is effective and isnt environmentally harmful.

Lots of potential environmental hazards there.

This is what you do...1) tie up the property on a contract with a LONG feasibility period2) do all of your studies i.e environmental, city/usage, percolation test, geotech, wetland, etc, etc, etc.3) Work with the city/county to determine the max lot coverage/square footage/cleared area/etc4) find plans or have them drawn for this duplex and take those to the city/county for approval5) Take everything all the way to the stage of being almost ready to pickup the permit but don't pay for it and pick it up quite yet.6) Package it up and go "sell the dream" to an investor who can afford to actually build the thing.Around here, raw land might be worth 1/3rd the final value of a project so if you think a brand new duplex there would be worth $150k, your new package deal could be worth around $50k.A word of caution... in my area, most vacant land is vacant because it's unbuildable or does not make economic sense to build on.

Seller does not want to remove, lender won’t escrow for it or close with that environmental hazard in the home.

Off the top of my head, I would want to know about zoning, dividable, legal access, physical access, road agreements, easements, floodplains, utility access, wells, well agreements, setbacks, environmental issues, and soil tests.

I do environmental consulting for raw land development and let me tell you that for building on even a SFH on a small lot you're talking at least 100k in soft costs to break ground!

That should give you the knowledge that you need to deal with mold.Travis West, CIEC, MAC0325CIEC - Certified Indoor Environmental Consultant, American Council of Accredited CertificationsMAC0325 - State-licensed Mold Assessment Consultant, Texas Department of State Health Services

Environmental and reclamation obligations can be enormous.