Not something I would advise, but where I was at, and my mindset was, in my 20s and when its just me, worse case is I go bankrupt and loose everything.

My family owns a building that we leased to a KFC franchisee who has since gone bankrupt.

Money/anti-debt guru Dave Ramsey lost his wealth and almost lost his marriage when he went bankrupt after his short-term notes got called. 

Just remember how Dave Ramsey went bankrupt.  

let us say that i invest via fundrise syndication deal. what will happen if fundrise bankrupts?

The breakup of relationships have bankrupted more investors than any other cause. 

One note of caution is Puerto Rico is almost bankrupt.

Minor things like missing copper, broken pipes, hot water heaters are one thing, mold and termite infestation can bankrupt you fast.

Even for multifamily investors, current cap rates are elusive and many will go bankrupt when the tech bubble will collapse and that interest rates will be raised a few pointsHome ownership does not always make sense; money can also be invested in much more profitable ventures that RE

I am thinking of 80% ($78k) as a bank typically does, but the buyer then may not have enough money from his pocket to purchase and do the rehab so we can not do the deal.(2) how should the lending note be structured so that  in case the buyer goes bankrupt, i can still be protected?