There is ZERO upside to paying utilities at a SFR.... if its free to the tenant there is ZERO incentive for them to keep their use reasonable....If I didn't have to pay my utilities you can be damn sure I would have my AC on 70 degrees on ALL summer and the heat at 82 ALL winter

Those are the main numbers, you might also want to look at a heat map of crime for the areas that you are looking at a bit more closely

It's an old row/townhouse in B class neighborhood and it has duct for heating system so I have an option to add central A/C to existing heating system.

What's the heating/cooling situation? 

But tenant has to pay all utilities - water/sewer, gas for heat, electric.

BP,     My wife and I are going through our inspection report for a two family we have an accepted offer on and the inspector noticed that there are black soot like heat streaks staining above the baseboard heat in the bedroom and living room of rental unit. 

I ran the numbers, see below - the expenses are almost too low, so first thing will be to do my due diligence.On the plus side she is not in a rush, the property won't be listed for a while (if at all, if I can get in quickly with a solid offer).Purchase price (est) $775,000Units 13Annual income $112,000 (assuming 7% vacancy, all units currently leased)Operating expenses $39,000 (all electric on separate meters, heat is electric.

There are probably State laws that apply as well as local ordinances in some cities.Although I'm not 100% sure, I THINK a landlord is required to keep the rental "habitable" which I think includes things like hot water and a heating system but not things like lawn care or air conditioning. 

Once in a while I've called to see that the sewer is being paid.Through the years it's become a little harder to inquire if other utilities are being paid but the only one that ever concerns me is natural gas for units that have natural gas heat. 

Trying to fix & flip in the summer months could be challenging with the heat as there is less economic activity.