Here is the list of lenders specialising in lending to retirement accounts:https://www.biggerpockets.com/...

Well it took you several months for you to uncover the issue....how was it then supposed to be discovered in a couple hour time frame from the inspector?

With supply being in the red across the Austin-Round Rock MSA, supply in peripheral cities is being uncovered and made available to purchase. 

You'll need to consider setbacks, covered vs uncovered ground (how much asphalt / concrete / building can exist), zoning (does the area allow multi-family or do you need a variance) population density requirements, building height requirements, and any other fun things that the town regulates. 

That may uncover any recent claims. 

There are deals in every market, the key is to figure out how to uncover those. 

I’d negotiate hard for the right price on this one, and be ready to walk if the seller is unreasonable as there are likely some additional issues hiding in the walls that you haven’t uncovered yet.

@Michael Carbonare Thank you Michael for mentioning it,because some people was telling me to find a good attorney specialising on those kind of deals,how about seller financing,do you need an attorney?

However, these types of properties can go wrong in a hurry as there oftentimes structural issues that aren't uncovered until later.

With the goal of getting lucky and uncovering a motivated seller, etc.