-Structural (foundation, wall, ceiling and floor)-Roof and Exterior(Roof Condition,Gutters and Downspouts, Siding, Windows and Doors)-Plumbing (Water Pressure,Leaks, Drainage, Pipes)-Electrical (Wiring,Outlets and Switches,Breaker Panel, Lighting Fixtures)-HVAC(Air Ducts, heating and cooling)-Water and Moisture Issues(Attic, Mold and Mildew)-Kitchen and Appliances-Bathrooms-Pest and Insect Problems-Safety Features

We heat and keep the doors closed and don't have issues normally.

Upgrades include a fully remodeled kitchen, renovated bathrooms, new durable flooring, contemporary fixtures, and efficient heating and cooling systems.

Heating costs and interest rates dont help the numbers but demand is high and resale numbers have been impressive

[I think someone else provided an example of this case earlier]-Now provided you do qualify for purchasing a house (4 units or less), you will have no problem qualifying for a mortgage with a Schedule 1 bank as long as you provide the down payment (35% minimum of purchase price) and confirm proof of fund and the source of it- On the proof and source of funds, the banks would want to see an income enough to cover the mortgage payment and other expenses. and in some cases, they would want to make sure they know how you're going to cover your expenses (housing, heating, etc..) where you live.This is usually where it gets annoying for some folks but if you can satisfy this, you should be able to qualify for a mortgage just likely any Canadian tax resident, albeit you will pay a little more in terms of interest rate, etc.

It is naturally insulated and it captures passive heat with strategically placed windows.

Waiting for or getting the dreaded call that xyz was broken, flooded etc. which only happens after hours on weekend, holiday, during heat wave or snow storm. 

@Alecia Loveless is correct--tenants need access 24/7 to their electric service panel, water and heat, assuming those are individual utilities for each unit. 

Installing thermostats with regulated heat control (we pay heat) 3.

Also control the thermostats so the tenants don't jack up the heat in the winter giving you a massive bill.