Lenders look at creditworthiness/balance sheet/track record and the collateral in determining the leverage they will offer.

That will allow you to better place your money in areas you know can succeed whether it be in the arbitrage or ownership space.

He determined the price and terms for the property, and according to the agents involved, he consulted with accountants and attorneys before signing the contract.

Those are probably the biggest questions someone needs to know to determine the feasibility of your ask.  

Determine at what percentage of completion you'll pay for work done. i.e.

This involves working backward from the final aim to determine the steps.

If it does go to probate, hopefully your brothers and you can amicably go the informal route vs formal (I've worked with families in both when buying properties out of probate and informal is FAR easier).Since there's no debt on the house, maybe you could sell with financing or maybe you could even buy out your brothers with financing -- that way you maintain ownership and just pay them a monthly amount.

Take ownership of your mistake and learn to do the proper due diligence recommended above😊 Wow!

Purchasing the LLC gives you ownership of the property, but it also opens you up to additional legal exposure since the entity has been active, and there is no way to really know for sure what else they used the LLC for.

I would recommend fixing it and then determining whether or not to sell based on cash flow and profit after the sale.