Like deferred maintenance, (bad roof, worn out water heater/AC Unit, warped flooring, water damage) etc, unpaid utilities,  unpaid taxes, a second loan, unpaid HOA fees, a bad pool, bad reputation, sometimes squatters, sometimes they were drug houses, and so on.

In terms of maintenance, they are generally safer because you are not responsible for the exterior and common areas and potential leaks, etc.

The 1% rule is a simple rule which is easy to calculate and describe. 

Hey Tanner, Some analysis I'd recommend:-Market Rents-How much renovation is needed to command top $ rents-Is the home located in an appreciating neighborhoodHousehacking is simple!

We have a large salt water spa and your salesperson is wrong about the maintenance.

They are pretty simple loans simple interest loans ,1- 10 years .

I mainly want a site that offers advertising the property, online payment options, maintenance requests & at least a basic accounting aspect.Thank you in advance!

Anyone speaking in "sure-thing / simple" terms, I call BS. 

@Dustin Horner you should be contracting maintenance work and creating a preferred list of vendors as @Phillip Austin has recommended.The first person you hire to help you should be to handle what you LEAST like to do yourself or has the greatest time savings for you!

No one understands (except the PM) why it cost $100 to send the maintenance guy to change $3 worth of batteries.