In most single family zoned areas adding a single ADU is not a value add meaning it will not add more value than the hands off cost of the addition.  

I plan on my income jumping a fairly good amount, especially since I will transfer to working a full time position.

Sunrise on the other hand invests in mobile homes and parking lots for the most part.  

<<< Of course that is what I am trying to tell you but don't confuse 'advantage' with 'different' -- if your goal to is maximize your return than you should be more hands on; if your goal is more to save time and hassle then let someone else do it all for you; in the end you get what you put in. 

The notice may be delivered in the following ways: Personally handing the Notice to the TenantGiving the Notice to someone who is at least 13 years old and who is at the Tenant's home Mail the Notice by Certified Mail with a Return Receipt from the TenantLeaving the Notice on the Ground in front of the Tenant if they refuse to accept itPosting the Notice of the door of the premises if nobody is living thereCounting the Notice Period.

On the other hand if they are a sponsor that is experienced in stopping a skin in the game, that's a huge red flag for me.c) how open to scrutiny are they?

The one cost will be getting the units furnished, but if you live in the area it isn't hard to source a bunch of decent 2nd hand furniture on Craigslist or FB market

They used a HELOC to finance a multi-family purchase, which allowed them to make staggered acquisitions and keep cash on hand for renovations.

If your bottom line is so tight that you are hand-wringing and making forum posts asking about a second colander, the problem lies with you.2.

If it keeps getting out of hand then I would then send a notice to quit to the troubling tenant.