In this case these loans were taken as historically low rates - any refinance is going to result in a rate increase from the present rates.

So far, I’ve purchased a 3 bedroom single family in a historic quiet neighborhood in Columbus, Ohio.

I would call the utility company to get past historical usage for your estimates.

Cash on Cash (COC) ROI: $4,380/$26,000 = 16% COC ROIOverall Return: including Cashflow, principal pay down and assuming 3% capital appreciation in Hamilton based on historic rates: $4,380 + $10,257 + $19,500 = $34,137/$26,000 = 131% OVERALL RETURN!

In some parts of the city Houses are selling in 1 day at historic highs and other neighborhoods have more inventory of fair market priced similar homes.

Depending when you bought the asset, you can report the sale at discount to avoid the cap gain but there will always be recapture even if you distribute at historical cost (basis).

Are the rents expected to grow at least on par with inflation (historical trends may help)?

The numbers were slightly better in AB from a cashflow perspective, but the appreciation was much stronger historically in BC and also a bit less vulnerable to the oil & gas industry which has hit AB properties hard along with COVID. 

 - Knob and tube wiring, screw-in fuses, low amperage feed to building - The historical designation prohibits freedom to renovate with modern materials - unlined chimneys - egress does not meet modern code (e.g. window opening size, 2nd egress from bedrooms) - cast iron internal waste or water feed lines - outlets are out of code (GFI for washers, over counters, in washrooms) - hardwired, interconnected fire alarms may now be required - old underground utilities or oil tanks that are not known - dry rot in floors from old water leaks - trees have deep roots that entangle waste lines - nothing, absolutely nothing, is plumb anymore. 

Its very linear historically.