Usually some hefty consequences for doing that. 

Loaning money has no tax consequence other than interest income that you pay yourself.

Keeping in mind the potential legal consequences of renting out an accessory unit without living in the primary dwelling, it could be a great option for cash flow (especially if you want to maintain your autonomy but have someone else pay your mortgage) and an added bonus to differentiate your property from others in a major way when it comes to selling the property.

Of course you don't need to do everything as is, but as a consequence, you accept that risk of loss.

Rents are up 30-50% within the past few years and amazingly, since these properties were purchased.The more government intervention, the more opportunities to benefit from the Law of Unintended Consequences. 

I am not an experienced REI, however I work with a large number of young adults executing duties that could have serious consequences in the military.I would seek out an employee who could teach you the mistakes you would make before you make them.

In most cases, foreclosure may have more consequences than you think when your credit report is ruined and even a landlord will not accept you as a tenant.

I am interested in single family and multi family homes, eventually perhaps something larger.I am a pilot, and consequently am on the road quite a bit, which has made it more difficult to get started.  

Given the long term relationship required with the PM, the consequences of bad PM, and the reputation of many PM companies, it seems worthy of an entire software application/web site in my opinion.

By consequence are you paying for half of his travel?