Same thing with Oil.

Balloon" framing (1920's I believe).Radon.Plaster and lathe instead of sheet rock (pre 1950's) or plaster and wire mesh variations (50's) more solid than sheetrock but a real b*tch to repair or demo if you're remodeling.You've got Galvy plumbing but also need to look out for other kinds of outdated plumbing like clay sewer lines (pre-1930's, prone to collapsing, bellies, root intrusion), cast iron (1950's, often rusted and/or cracked by now), and PB (polybutylene, gray-colored water pipes, 1980's, prone to rapid degradation and subsequent bursting, mostly gone by now).Buried Oil Tanks-- Do you have those there?

For example, when industries became monopolistic like oil and railroads, which a purely capitalistic system would say "meah, oh-well, is what it is", our socialist-capitalism system "broke them up" "for the public good". 

One big factor to the numbers is the cost of oil heat, this has been a concern to me.

Oil prices continue to fall decreasing profit margins for a lot of large companies, but also increasing them for a few.  

PCBs, asbestos, solvents, used oil, freon, etc.) storage or use (i.e. home based mechanic or autobody shop) - and those contained within the improvements themselves - this is where your list of asbestos, lead paint, mould, etc. would come into play

-We can borrower funds from the IUL to invest in more Real Estate once my husband leaves his high income job (Oil Production) to continue growing our RE empire.

Anytime you're trying to block mold, use an oil based product.  

But if the pop-corn looks fine (ie no licks or oil spot from the kitchen then why bother unless is a hi end unit) 

And then there were MORE nicotine stains under that adhering to the original oil- based paint on those masonry walls.I didn't have a respirator there.