At that time we updated the electrical, heating, and in Dec 2016 put on new roof.

The first floor contained a coffee shop, yoga studio and gym.

Oil is a pain in the butt and the tenants will complain of high heating bills. 

Since then they've improved some of the mechanicals including 2 water heats, and installed an oil burning forced air furnace for one apartment.

When I asked for the heating to be repaired I knew I had the law on my side...

In addition, the renters pay something called "nebenkosten"(additional costs), this additional cost covers all insurances, property maintenance, lawn maintenance etc. they need to pay the electricity and heating charges separately: so total rent would be: Net rent(Kaltmiete)+Nebenkosten(additional costs)+ electricity/heating(paid by the renter directly depending on use)I.e 1450(net rent) + 200(addition rent or nebenkosten, which covers all maintenance)= 1650(Gross rent)So the figures I gave you does not include insurances etc: So the monthly payment I need to make the seller excludes maintenance etc, and hence 800€ is the amount remaining after everything is paid of.

Cloud MN same renter since oct 2011. 2) 2800sq ft modified 2 story in Big Lake, MN with 6 heated garage stalls on 2 acres.

Also took into consideration the roof is less than 5 and the heat pump (air/heat unit) is under 10.

Heating fuel tanks that can be above found or buried underground.

Once you add-in the cost of utilities (especially heat), furnishings (couches, tables and chairs, beds, sheets, towels, table cloths, pots and pans and plates and silverware, napkins, toilet paper, TV's and radios, washer and dryer and refrigerator - yes, it's common for a long-term SFR not to include a washer, dryer, or refrigerator - etc, etc, etc), plowing/lawn/trash (or HOA fees), cleaning, extra repairs and maintenance (I promise that a long-term house renter takes better care and causes less wear and tear than a revolving door of vacation renters), turnover management and screening, etc, etc, you are not making any more with the vacation rental than with the long-term SFR where the tenants pay all the utilities (possibly with the exception of water/sewer), and take care of the lawn and snow, and provide their own furnishings soup to nuts.