You should have separate LLCs and separate bank accounts for flips and rentals. 

This means you can buy a SF and convert or build a separate unit.

I guess i'm looking for software that separates tenants, from PM, from owner well. 

They're close enough together that you'll have trouble separating root balls on each plant.

A standalone ADU is almost always going to cost more than doing an addition, so the value added or cash flow increases will have to justify each.I work with a team of investors who will buy SFR homes then build a new ADU on the lot and add a separate drive way and meters for utilities in North Texas. 

I understand that "a feeling" and sound investment basis are two separate things... so I have a few questions as I evaluate the sensibility of our first investment property being in Tulum, Mexico.1. 

Those 8th and 9th units, are they separate from the other 7?

This is going off the original topic - I could post as a separate topic.That is super helpful for those looking out of state.

Consider the emotional aspect too. 

Have separate bank accounts for each LLC and never commingle personal funds or funds between LLCs.