If its too open, it can't provide the privacy of a bedroom and would likely not be counted as such. 

Three employees in a nice single-family home with full kitchen, laundry, all utilities, privacy, etc. for about 1/2 what a hotel would cost and less than a typical vacation rental.

I understand tenants had the right to privacy, that was not my intention.

If you have an obvious duplex on the front, the ADU would not be permitted in any case.  2 units max.The height max on the ADU should be 24', but you do have bulk plane to contend with - and to your point, NO upper story decks are allowed on an ADU anywhere (back yard privacy thing). 

Most sellers: 1) Take offense to people knowing their business2) Think they have more privacy than they think...You'll find sellers who try to hide what they owe on their mortgage...when a simple Propstream search can bring it up in 3 minutes. 

I would personally never even consider violating my tenants' privacy in this manner, but I am ignorant in regards to any potential legal implications.

@Quentin Hildreth the purpose of titling a property in a trust in for Privacy. 

You still have your own space and privacy (plus others may not want to live with a 2 year old). 

I think my biggest concern is just privacy for everyone when I do begin since single family homes aren’t separated units

It's about 85% complete, we just need to finish the first floor full bath and 3rd bedroom, put in a new privacy fence, and hopefully add central AC in the spring.