Related, is a personal investor guarantee of either loan repayment standard or is only the LLC (with property) liable for repayment? 

I think solar is exciting and there are many benefits that I think alone warrant investing in Solar in some instances, but what I think makes Tesla's roof tiles a potentially viable strategy is the shingles themselves are guaranteed for life (assuming Tesla doesn't go out of business)....

My PM lender wants a guaranteed return, so I am paying her a min of 3 month's interest.My PM lender and I worked out the terms and she has an attorney who will draft the docs. 

That right doesn't need to go with any property guarantee, inspection, title search or anything to do with the property.

If your doing this just to increase the numbers to buy, what is the guarantee that they will still sell it to you once its "fixed"Personally if I was interested in the project.

HUD financing can be a good way to go, if you can and funds are available in your area.Yes, as the loan amount sky rockets, personal guarantees can fade away as risks increase.I like to give the example of insured losses as I've been there.

Nothing you can do specifically to guarantee this result.Many factors play a role.The market.Sellers desire or NEED to sellStrength of your offer.

If one person guarantees the loan, then there needs to be a separate agreement between the parties (outside of the loan itself) detailing who is responsible for guaranteeing the payment of the loan and what happens if the loan is not satisfied. 

I GUARANTEE you that you will WASTE more money than a professional manager would cost! 

You'd still personally guarantee the loan.