I'd talk to a local business broker to compare other shops for sale.  

Only comparing the potential rent to offset the mortgage will not result in a good outcome for you.

It is also likely there is no vapour barrier - and if there is, it's almost guaranteed it is not fully sealed.Windows, if original, are most probably built in-place with single glazing (no thermal panes) and no gaskets or weather stripping {read: they probably leak).If the electrical has not been updated, you very likely have ungrounded wiring, though it is possible you may have early grounded (NMD-3).  

Hope this helps awser your question.It took me a number of years to get here so it is not all that glamorous compared to some of the other REI players highlighted story.

Not a whole lot going on here comparatively, but like anywhere else, there is still potential.

Understand the fees involved and calculate the total cost for an entire year of management so you can compare the different managers.

IE west coast high priced compared to rust belt areas were homes are rentals are priced like used vehicles.. but even those low value assets will have running costs that will exceed cash flow many times..  

BUT if it does well you will most likely make much more money in the next 10 years compared to RE It would take less money but would take a huge amount of time and additional risk

I would encourage you to compare all the groups, then go with REI for peace of mind. 

Really compared to anything else it seems like a no brainer.