You then think you're doing them a factor offering them well below FMV so you can stick your margin in the deal.So instead of broadly advertising this in someplace where you could get a lot of people looking like MLS, you'll resort to cheesy hand-written letters or visually polluting road signs to cultivate a list. 

A text doesn't pollute.

It would be illegal and get flagged as unauthorized deleading (UD) and you would NEVER be able to get a lead cert, only a letter of environmental protection which states you performed UD, got caught, then had to pay a licensed deleader to come in and fix it.

-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 Liens-Child Support LiensThese are the liens not included when the seller goes to pay for title insurance, most liens will be cleared except these.

I saw new businesses a coffee & pastry cafe, a bridal bar, and a Environmental Learning Center.

And under pollution laws, anybody in the chain of title including the tax sale buyer, is responsible for any pollution damage that can be proven in court to come from this property. 

Spotted owl and other environmental issue closed up vast amounts of timber land to the markets. 

At the rate it was crumbling, it seemed that I may well be able to dig through all 10 inches the concrete with my hand, all the way into the basement in about 10 minutes with only my bare hand.Is the cause of this deterioration something due to the original concrete mix 100 years ago or is it some sort of environmental issue, like water.  

Luckily, the renovations fell short of the 50% threshold and were approved by the Environmental Protection Board.

First stop, call your local health department or whomever oversees environmental permitting.