Find an older one who'd rather sit back and get the interest than the higher return higher involvement of another flip.

That may or may not involve a trust. 

No agents involved.

One option I have is to demo and rebuild the house using insurance money but it will take about a year and lot of involvement.

Sounded like there was heavy paperwork involved.  

Additionally, involve a real estate attorney to ensure the transaction aligns with legal requirements and protects both parties’ interests.

Yes, I have been involved with several "mold" properties that still had high mold levels after remediation.  

This issue, if caught early, is probably fixable with out insurance involvement because the deductible might be more than the repair cost.  

Sometimes occupants still live there and eviction is not easy, and I have even heard a story once that the yakuza are involved in the construction and real estate business and exorted money from buyers through occupants in these properties. 

Would love to get more involved in investing in the great state of SC.