Eventually, before closing, you will need to "disclose it" to them, but it's very possible to do so in a way that they won't even care; it will be a technicality to them, and nothing more, because you've done an excellent job delivering them the exact solution they needed, and they trust you. 

I believe outsourcing to a small accounting firm is the key.

The previous owners had allowed certain key aspects of this property to fall into an UNSAFE level of disrepair.

They’re pretty low cost and I’ve never had them fail to deliver. 

—What is the max you would pay for a property where rents are $5,000 total, assume a 4-Unit and assume tenants pay utilities, renovated turn key.

Make sure everyone got all the scope of work correct, and make your decision based on their track record (this is the key) and cost, don't let emotion influence your decision.

In Louisville area is key to making such a rehab even worth the effort.

We are focusing to offer and developpe in that ideally located area, 20 min from Beaches or Downtown, high quality turn key family home below a Million dollar.there is a huge demand and need for renters living and working in the west side and surrounding who can't afford to buy where they live.

@Jared Lawrence1- Develop your OKR's2- Build your team3- Everything elseAnd remember, executing what you learned as soon as you learn it is key.

Obviously your statement that the beams and foundation appear untouched by the fire is key.