I’m currently seeking a new CPA.

Not a bad ROI, but the area overall, outside of Park Circle, hasn't seen the same improvements as other areas in Charleston.I grew up in Summerville and there are a few neighborhoods that have investment activity.

Our property had shown signs of termite damage to a structural beam during the initial inspection, and I paid for both a structural engineer (to verify the beam’s integrity was sound) and a termite inspector (to verify there was no active infestation).  

Active investors like you, who might have a DTI higher than some banks want, should ask to use alternative UW methods like asset depletion. 

Is the landlord trying actively to rent it out?

From my experience, most brokerages are actively hiring at all times and will gladly bring you in to discuss their operation and the possibility of you joining. 

You may find out that the owner does not have permission to lease his land out to the use that's on the property even though its commercial.Contact a couple of local commercial real estate brokers who are active in the immediate area, they should be able to give some guidance as to the going rental rates for land uses.

He will have to apply for the permit and install the system to code.You should seek  legal advice as to how to handle the initial code violation.

Specifically, I am seeking to meet cash buyers, realtors, and other wholesalers to network with.

they probably want to get that loan off their books and deal with loans with higher interest rates, so they are telling you that you have to sell. unless someone else has an idea on this, you may want to seek an attorneys advice or find another lender, even if it is hard money until you find a bank.