I agree with the thesis, but perhaps not the timeline ... though, had you told anyone in 1875 that the whale oil industry would disappear in 20-years, they may have thought you crazy as well.As much as I love my diesels ... their day is drawing to a close.

It was the oil heating system which was costing over $10K a year!  

A "side effect" is that you can often charge a little more rent next tenant because you know it only uses 400 gallons of oil each year vs. the 550 it used to use. 

They will not accept things such as flushable wipes, personal wipes, baby wipes, paper diapers, sanitary napkins, tampons, wads of toilet paper, dental floss, balls of hair, paper towels, newspapers, grease, oil, table scraps, bones, clothing, rags, sand, dirt, rocks, or children’s toys.

Two of the units have separate oil furnaces and the tenants pay their own heat and hot water.

JonI have a spreadsheet I use that lets me input actual known expenses, like insurance, taxes, oil, elec., sewer, water, etc. and then lets me input my own percentages for (self paid) mgmt, repairs, etc.

Now, I'd always be looking at who would benefit from a conflict, the oil companies, banking, maybe industry, who (?)

Buying into certain types of oil and gas interestsPurchasing mineral rightsInvesting in water rights Purchasing air rights The above list provides you with the more common and the not so common options.  

So in the last 12 months these are some of those kinds of unusual expenses:- replace oil tank $1800- replace Bilco door wrecked by tenant $950- replace sewer pipe clogged with roots $2000- repair neighbors gutters that were destroyed by one of our trees $250Anyone else have unusual/extenuating expense stories?

Based on your location, I'd assume it's a heat pump, but if not, is it an oil or gas furnace?