Hate to burst your bubble....The new 2018 IRC (International Residential Code) does have a new section dedicated to Tiny Homes.

That's like saying an internal combustion engine should be simple...gas goes in and torque comes out

My tenants are an international doctoral candidate and her spouse so they plan stay in the house for awhile.

Lots of offers usually brings in volume so you want to make sure you are setup for high volume internally.

To the seller it's just cash, so they really don't need to know any details of your own internal financing.  

It is time for me to share another story concerning one of my international investments in Medellin, Colombia, South America. 

I had some international people stay in my place for 2 months. 

It should specify ownership, control, and how internal disputes will be handled. 

The ordinances I've seen specify a limit of 3 unrelated people total, such as a husband, wife and international travel student; not 2 students!

So my advice would be to compare all investment opportunities on math measures like Cash on Cash return and Internal Rate of Return not on whether they are a 'business' or 'real estate'.To explain this way better than I ever could I'd recommend you read (or better yet listen to while riding a motorcycle) 'Am I being to Subtle?'