One report I saw said that something like 80% of the ADUs built were to house parents/children of the homeowner and were not being rented out.

Record keeping and providing evidence are the key.Airbnb: toilet is reported as clogged on 4th day of 5 night (6 day) guest stay.  

I wouldn't discount that credit report.

You may not collect anything, but it will sit on his credit report and prevent him from getting a car loan, home loan, or scamming another landlord.

These are reported on your Schedule K-1 and taxed at your marginal tax rate.

One thing he didn’t anticipate was the complexity of the reporting requiremnets, especially if he wanted investors outside his immediate circle.

The only logical way a company would know their average tenant stay, is by running a report.

We use this along with NY fed report on delinquencies and track bankruptcies as well.

I'm hoping someone could explain to me what this means on the HUD Property Condition Report - pour water/antifreeze in drains - fail.

It offers monthly accounting reports, online payment options, website creation ability, maintenance requests (filtered by property), advertising, online tenant screening, lease creations and tenant/property match functionalities.