In your case, it'll be a 100 gallon tank for 4 units.

If you have a softener or filtration equipment like an iron filter, it'd likely be best for you to setup a quarterly PM from a local water treatment company to ensure your filters are changed out regularly and salt is added to the brine tank - especially if you have a boiler.PM me for a couple references of companies that work in the area...my family's business is in water treatment for commercial and industrial applications in the Midwest, but we have a couple companies we refer residential folks to.

Since nothing was going down the drain, all the water in the field lines had gone away.When we buy, we have the septic tank checked out, but there’s no real way to test the field lines.

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?

I don't allow my tenants to have access to my furnace or hot water tank. but we're  re-thinking this issue and trying to fix it......

However, that could be a problem if you have oil heat and there's only one oil tank or there is only one boiler/furnace for the entire building.Do you know the situation with meters and heating?

That said, one of my tenants over the years has acquired a parakeet and a fish tank, but she keeps the house immaculately clean, and says she doesn't ever want "pets" ;)I do allow pets in our condos, but they are regulated by the association rules (less than 20 pounds).

Landlord attempts to purchase parts and labor insurance for water and heating tanks for the entire house (two units).

Beware of an underground oil tank for the side you say has "forced air."

Scale, hardwater, well water with sand in it, debris from flushing hot water tanks, debris from dip tube failures in the hot water heater, all play havoc with all modern fixtures.