Late payment charges, medical expenses, unpaid water/electrical/phone, HELOC's gone awry, etc.

Easy to self manage with Vrbo and Airbnb, then hire a cleaning service to handle turnovers.

My husband and I spent two weeks with two 30 yard dumpsters cleaning up the property.

I don't want to say you need to provide your tenants with clean units because many tenants are pigs.If you can't get your rents increase to at least $700 per unit then even though you paid a very low price for the property I still think you purchase a dog because the problem with low rents is when you need to do improvements you don't have enough money coming in.Example.

If there is potential damage to the electrical system, there is reason to shut off the power if it is not already off.

You might as well come clean to the lenders. 

We're now trying to clean things up via an LLC. 

Any add-on technologies I should leverage to manage the property, cleaning service, or etc?

The building was constructed in the early 2000's so the electrical service, water mains, and sewer lines are all relatively new.

The major systems to note for CapEx are foundation, electrical, HVAC, and plumbing.