@Sebastian NadalI've used Zillow Rental Manager to screen my tenants and have found it effective.

The sooner you regain control, prove that you fully intend to enforce the terms of your lease, and that you will not be 'played' by their recall of events or documents, the more effective this action will be.  

I started with the Simple Start plan, but as I learn more about the software, I realize that to effectively classify income and expenses per unit, I need to use Classes and Locations, which are only available on the higher-tier plans.I’ve seen suggestions to use units as customers as a workaround, but I’m curious if anyone else has tried this approach or has recommendations for managing multiple units in QuickBooks with the Simple Start plan.Looking forward to your feedback!

Stop hanging out with your deadbeat buddies who spend all day drinking, talking sports, and otherwise wasting away.

That could be thousands of dollars, and you might not even close, so they just wasted several grand for no reason.

I've seen banks be very competitive with blanket loans that cover multiple properties and/or multi-family properties, e.g. 5+ units.Mortgage Brokers (obviously I'm biased) - Brokers have the ability to work with all of the above and can get you to the best lender for your scenario right away instead of having you waste your time with the wrong type of lender.

If not, you're likely wasting your time.

Stop hanging out with your deadbeat buddies who spend all day drinking, talking sports, and otherwise wasting away.

A financial advisor with real estate experience can help you plan effectively.

Anything less is wasting your time and screwing the seller.