Unfortunately I've been laid off with the slow down in the oil market.  

This one is ideal if you have to share what you do with someone who may be skeptical of business or capitalism ( I use this if they are serving vegan food, humus and smell of patchouli oil)...Congrats on your success housing others and .....Best of luck.

Oil, gold, diamonds, wood and other natural resources were stolen from the earth and sold for lots of money.

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b*tch to repair or demo if you're remodeling.You've got Galvy plumbing but also need to look out for other kinds of outdated plumbing like clay sewer lines (pre-1930's, prone to collapsing, bellies, root intrusion), cast iron (1950's, often rusted and/or cracked by now), and PB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.

They are a canker sore on the mouth of a society and state that has been figuratively trying to suck on an allotropic lemon, a sore that won't go away for generations on end.

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