However, this fourplex is up to par(all tile floors, bathroom and kitchen redone) and will be physically seeing the inside tomorrow.

You want hard assets you can measure, touch, weigh and physically see.  

From my experience (I'm using an attorney to form an LLC currently) you need a physical address for the state It's in, so I'd go with California.This isn't legal advice, and j could be wrong.

Some may be able to see how this all works physically and then apply to physical RE.

I will start working with my doctorate in physical therapy in November.

I will start working with my doctorate in physical therapy in November.

It's not a physical team with a unified goal, they are your go-to service providers.

Probably being overly paranoid, but since FL requires the use of a physical street address not a PO Box, I'm wondering if using my personal residence as the primary business address would create a legal avenue to access my home in the event the LLC's assets are attacked.I know some folks use a registered agent service, but wondering if that expense ($150-$250 per year) is necessary.

You may want to have the tenant pay this, or realize that this is an additional expense for yourself.Once a house goes rental, the physical condition usually depreciates faster than an owner occupant.  

Unfortunately, I won't be able to make it to the meetup physically but my wife has agreed to attend this one and a few others I found in Clarksville and Nashville.