It's very rare but if you put in enough bids at $70k below tax then eventually one will hit.

I'm still new and I know I will get there eventually.

I would eventually like to fix up and own a few apartment complexes. 

If you're looking to have them out, gear up for filing the eviction, plain and simple, as you're right about the likelihood of them staying over term.That said, unless your lease says something explicitly about showing the unit while they occupy it AND (my personal opinion) you've gone over that eventuality with the tenants and they've said that would be OK, I understand them being uncomfortable with strangers walking through their home.

Since you'll be next door you can leave a letter or something with contact info but you will, of course, eventually meet them face to face. 

I'll make some assumptions that we all like to procreate and eventually have kids. 

Not sure if any of this helps but I hope that you eventually find what you are looking for.  

If I want to eventually move out and rent the studio, must I have it rezoned to rent that out?

If I keep buying properties won't this eventually get "tapped out"?  

Eventually you will change jobs.