Since you owner-occupied it, doing 5% down on your conventional would've both lowered your cost of entry (saving cash for repairs), and juiced your CoC returns even more.

Look into a renovation loan that would cover both the purchase and the rehab costs.

Dumpster cost Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Even if you have enough for a down payment and closing costs, there is always a chance the furnace or AC goes out the first time you try to turn it on (typically this would be caught by an inspector), or some major damage happens that insurance doesn't cover.  

At the end of the day, we’re running a business, and we’ve got employees and marketing costs to take care of, so we need to make sure it all adds up.

Wanted input on how much might be involved here to remediate, and what range of costs I am looking at, I fully understand that once the drywall is cut open there might be who knows how much damage to the framing, insulation, and whether it is worth it to even get involved with this property.

I chose Columbus, OH due to the lower entry costs, cashflow and appreciation and have been pretty happy with my decision so far. 

I would like to continue to self-manage this property, but I am open to a management company.

Quote from @Wesley Yu: Point him to the law and how he failed to give you notice.If you want to be nice, offer to compensate him for some of the cost, since it is technically your property.

Just leave things alone.If you don't deed it to the LLC, then it's a useless LLC costing you fees for no reason.