I’ve reached out in other forum subject for GC recommendations and I know asking dumb questions to them is unavoidable to certain extent...Can anyone give me an outline or talking points to have while selecting contractors?

I'd rather work with one person instead of multiple, but I realize this may be unavoidable.

There's an unavoidable risk associated with owning anything: cars, boats, bikes, properties and businesses.That's what insurance is for.Also, don't assume hiring a PMC will protect you 100%. 1) You'll only be protected as good as they are2) No matter what any PMC does, there are bound to be lawsuits from tenants & ambulance chasing lawyers trying to "get rich quick".

Is this unavoidable?

In some circumstances, vacancy is unavoidable because time is needed to prepare the unit. 

I'm sorry @Hilary Hageman, but you have simply not been doing this long enough to experience the true joy of significant cap ex (which is unavoidable for any property), stagnant rent growth, increasing expenses, and the general illiquidity that comes from owning the type of property you are describing.  

Much easier to take deductions and avoid or defer income tax...property tax is uncontrollable and unavoidable (barring abstinence).  

Of course, you can't spring any new requirements on them that weren't in their current lease, but you know what I mean.I'm not keen on inheriting tenants, but we all know it is sometimes unavoidable.

The basic idea with MB is that when developers and government infrastructure projects etc. unavoidably must destroy natural "habitat," they must either restore it or else offset the damage by purchasing credits in certified mitigation banks to preserve multiple acres more of habitat than was taken out.

If the cap expense is not accounted for there is no accurate calculation on the monthly cash flow (cap expense costs are unavoidable; they are coming).