The hilly terrain is a main reason for this and you can't really see that on a map so knowing the areas is key.We have old housing stock as well so big things like plumbing and electrical can vary cost wise if they have or haven't been updated.

Mainly LMLO's are rare, almost non-existant.  

To determine what to offer on a rental property:Determine reasonable market rent, NOT the highest!

It's on a Main Street (Perry BLVD), and it is on a bus line.About 8 months ago, one unit went vacant, and we can't find another tenant no matter what we try or how low we go with the posted rent.

Would there be any issues with me living in the unit that is not listed as the main address for the property? 

I have a many reasons why I'd like to invest.

Along with personal reasons IE living with tenant. 

, and I’ll need to have the series name on the property deed (is that as simple as naming it “123 Main St, and having the deed as “123 Main St, a series of My LLC”?).

There is a reason banks don't make loans on stocks.

I guess you're right about the amount, but the rate is reasonable.