I am curious as to what all professionals are necessary for the common REI.

As tenants in common(TIC) or through some type of legel entity?

Separate electric for each unit but common gas paid by landlord. 

I can see how this is a common mistake for new investors, such as myself.

Just be cautious to not mistake any improvement lately as "a rising tide lifts all boats".

I know this is a common strategy, but I was wondering if I should acquire the property through an LLC.

Make sure you understand the policy as they usually don't cover breakins or theft.As others have stated, it is pretty common for a PM to have a Master Policy that they add their clients to.

If anyone has any recommendations of groups/individuals who share that common interest, I would be much obliged.

Sometimes a note is added or a specific permit condition is added that will prohibit a use otherwise allowed within the zone...it's not common and probably less common out your way where entitlements are more reasonable, but still could be something to check.

If you have service issues (common enough, from the time I’ve spend in L&T Court), it can take 4-5 months.