Not a good strategy. 

I filed a claim and my insurance company is estimating the damage currently.

@Josh D. turn it in to your insurance and they will deal with the neighbors insurance.

I am hoping to find the best solution to this situation described below. Ultimately, I am looking to purchase/refinance with or without my siblin co-borrowing, then put an ADU on the home to rent out. My siblin is on ...

While property taxes are lower than some states in Colorado, homeowners insurance is quite steep.

Now, this is all dependent on your strategy (and money to implement it) but if I target off market properties in a state of disrepair then my down payment could be 0%...or I could target on market properties and use traditional financing and need 20% down.  

She had to coordinate with a lot of Landlords, Tenants, insurance companies, and contractors.

Property taxes and insurance. 

Maybe pay for one if you have a defined scope for a specific strategy. 

Some examples of strategies and mortgage options that can enhance investment are:- Check with a local credit union to join.