Now the tenant is saying that at the time the roof was fixed, the wetness inside walls and ceiling was not removed and has now become mold, which is affecting their child.

Both can have finished or unfinished floors; both can have a post and beam support system, block walls, or traditional box framing.

A good rule of thumb would be to stop wasting money going to that guru's seminars. $5,000 per major repair is nuts.

The info on it was far from updated and verified, I had a commercial listing of my own that went under contract on mls two weeks after listing, three months later it was still active on costarDon't waste your time or money.

NOt work on it for 10 days waste your time and especially contractors looking at deals that can't close.I know its frustrating. and out on the east coast were title I susually done at the end of the transactions I make them run it day one.. you should see the stares I get back.. ( hey why are you doing that ) for the exact same reason you just stated.I had my first resi deal in Calistoga cira 1975 and worked on that got ready to close 45 days into only to find out same circumstance you did.. now talk about a  bumbed out rookie 18 YO agent ..

I used hard money with a 9 month period to pay of the note I had it under contract twice in which  I wasted a lot of time and money just sitting on the market it ARV came in at $68000, the balance on the note is 40k interest only I have this property cash flowing 925/month. the bank has given me time to figure this out as well ofered me more money for new purchases .Credit not quite where it needs to be to refi but close if there is any one in the BP community that has advice or willing to partner with me on this deal to share the income I welcome you.

Can anyone on BP recommend a retaining wall that I can contact for some advice and hopefully an estimate?

You are wasting TONS of valuable time and money commuting which is a recipe for total burnout. 

Only thing that might be missing is insulation in the walls.

The IRA is treated in the same fashion as any other for tax purposes, but rather than being limited to what Wall St sells, you can invest in non-traditional assets such as real estate.As someone who is busy, turn-key real estate or brokered mortgage notes would be good avenues to research.