If you're lucky enough to have a local builder with experience building passive houses, you may be able to build a house which requires almost zero supplementary heating and cooling, and it will have lower water bills as well.

I am surprised they are running out of hot water fast, the smaller tanks should heat the water faster than the larger 50 gallon tanks, maybe look into small tank heaters with more heating coils to heat the water even faster. take a look at this one, available from HD too https://www.rheem.com/product/marathon-30-gallon-e...that one may deliver enough hot water for your tenants.

Larger MF is so over heated that returns are severely compressed. 

I pay water and gas for heat and electric for common area of course. 

It is bank owned asking around 95k it needs a touch up but practically all cosmetic barring a possible heating system issue. 

Great newer neighborhood with an HOA ($260/yr), heated community pool, and a large greenspace adjacent to the back yard.

You still had to pay for the dryers, but people got around that by letting their clothes dry on to of the heating vents in their dorm rooms.The floor RA had a sign on the door to the laundry room on his side of the hall that read, "KEEP THIS DOOR CLOSED.

I have never scraped heat off the windshield or shoveled it in 20 years!

We should all be watching this data like a hawk.So things have been heating up.

He can do this by doin a manual J or heat load calculation.