Also the overhead piping and duct work.

For a 3-story triplex, you need to redo the plumbing as you have to run water pipes, for hot and cold water to each unit.

@John Su tenants typically take care of snow when occupied, but owner is responsible when vacant - and some cities write tickets if snow not removed with x hours.In colder climates you also have to worry about keeping heat on when vacant so pipes don't freeze.

I get the bathroom it should have an exhaust fan.

Tree work, sewer line replacement/ repair, driveway repair, electrical main service replacement, HVAC, plumbing (galvanized/ polybutylene/ lead pipes failing/ water damage/ mold), garbage disposals, appliances are only made to last 3-5 years anymore, even handy people want $65/hr now, etc.

Pipes were pretty full already and by the time we got in there they clogged up and had to call a plumber to fix for $700 almost right away.

The following is a list of topics I've encountered in partnership agreements, although it's not exhaustive.

Definitely a non-exhaustive list and I'm not privy to your exact situation but hopefully this helps.1.

So, if mold simply develops over time and has nothing to do with a claimable situation like a pipe bursting, it won't be covered at all.Beyond that, there is likely a sublimit for mold as mentioned by Ken IF there is coverage at all. 

That is, sometimes an agent and seller with lower the fee to the agent when the property is tough to sell.This is a strong list but it is not exhaustive.