That said, we have this exact application that we have looked at/evaluated with one of our properties (duplex) that has separately metered electrical but one central air unit. 

i didn't even know auctions gave opportunities to actually have access to properties beforehand.Given your line of work, i would say that you are uniquely positioned to work well in the outlined situation.

Property Taxes on a past project in Decatur GA went from $1500 a year to $8,000.

Were you able to see that property? 

I’m really interested in commercial RE, rental properties, flipping, investment, and possibly wholesale.

How did you finance this deal?

Or the market goes crazy and the property value goes way up but she says she gets all the gained equity because she's been paying the whole mortgage all this time and she's dating a lawyer now who is on her side... 

But it would not be enough to move the needle to be motivated to buy such property.

Are properties such as this more appealing to buyers with renters already on leases or will I get more interest and a higher sales price if I sell the property vacant?  

A property that is listed on MLS has been conditioned" to sell.