Resists chemicals, urine, blood, MEK, acetone, oil, vomit, the whole 9 yards.  

Are the boilers the sole source of DHW or are there separate gas/oil fired hot water heaters?

If oil gets to $20 per barrel, I may move the 401k into Chevron or another oil stock for a year or so.Unless there is another wave of pending foreclosures, then housing prices should be fairly stable.

Leaking underground oil tanks, zoning issues, third-party easements, lead paint or asbestos, foundation problems, title issues, flood zone reclassification, etc etcSome of these could prevent financing but are solvable long term, so perhaps if you can pay cash you'd be OK.  

I see a lot more headwinds (Chinese economy, oil prices in oil states, credit market turmoil) than tailwinds (household creation/job growth, consumer spending).  

There are barrels of oil from his vehicles.

One risk I see is in my area oil prices being low is a bad thing.  

When the collateral is crops growing or to be grown, timber to be cut or minerals or the like (including oil and gas) or accounts subject to subdivision (5) of Section 9103, in the office where a mortgage on the real estate would be recorded.

Oil tank problems

When market went down and oil went to $25  a barrel my unit went unrented for 3 months.