We planned to close off the doors but realized if we do this, the other tenant will not have access to the basement where the electrical panels are. 

Getting the lowest balance out of the way is usually the quickest way to start snowballing extra payments into other debts you want to clean up. 

It just needed cleaned up and redesigned.

Lol only kidding, but seriously you can offer cash for keys but stipulate they leave the home clean, it will save you a lot of money just in labor cleaning up the place when they leave and if they leave it dirty remind them that was the stipulation.

We logged the site, cleaned up the garbage, cut in a few roads and waited for the market to boom.What was the outcome?

Lower electric bill, carbon foot print, blah blah blah. what's not to love.BUT I'm in Florida, not sure about you.

I would start with a written violation and demand they clean up their act or move out.

There's  plenty of parking however when my relator reached out to concord zoning they said it isn't able to be turned into a duplex " which to me means one address instead of two and I cant have separate water and electricity to the units".

That's at least 10 bathrooms, 10 kitchens with all new plumbing and electrical. probably new hvac too.

So I’m in a bit of a bind, I have a duplex I’m house hacking we remodeled entire thing, new hvac, electric panels, electric main, updated plumbing, water heaters, furnace, install central air, roof.