The second option is to sell and house-hack a fourplex, which offers more units, higher potential cash flow, leverage equity, and appreciation potential.

If so, do you have any paperwork that supports the vesting to be able to show a potential lender? 

2.What are the best and most cost-effective solutions for managing this potential long-term issue?

Additionally, have a clear budget, factoring in potential repair costs, and ensure you understand the rules about earnest money deposits and closing deadlines.LLC for Real Estate Investing: Forming an LLC for rental properties can offer liability protection and may provide tax advantages, though the tax benefits are non-existence for rentals.

On the positive side, it seems like you have a good potential BRRRR that you can use to purchase additional properties.

Bob is very good on the customer support and that being said... they are the only company other than myself that I have invested with  basically EVER... as I do my own deals.But I had money stacking up in my SDRA and of course I can't self deal.. so I chose one of his new investments which is more akin to what I like.. quicker turn and high IRR...

I have seen some properties on MLS that I contact my realtor and they may know right away the reason it isn't selling from showing it previously, or they can review the realtor comments that aren't viewable by the public on MLS.Other potential reasons I have seen properties listed on MLS for a long time. 1) Some investors may not be comfortable inheriting existing tenants.2) It may be it is a class C neighborhood. 3) Structural issues.

There was an interesting journal of accountancy article on this recently discussing the potential liability for CPA firms.  

Umbrella insurance can be a smart way to shield yourself and your partners from potential risks that basic policies might not cover.From what I’ve heard, local insurance agents familiar with investment properties in your area are a great starting point.

EDUCATE YOURSELF - yes, it will take time, but will lead to a selection that better meets your expectations & avoids potentially costly surprises!